154691969481 has 63 divisors (see below), whose sum is σ = 269927991543. Its totient is φ = 88352933760.

The previous prime is 154691969473. The next prime is 154691969507. The reversal of 154691969481 is 184969196451.

The square root of 154691969481 is 393309.

It is a perfect power (a square), and thus also a powerful number.

154691969481 is a `hidden beast` number, since 1 + 5 + 4 + 6 + 91 + 9 + 69 + 481 = 666.

It can be written as a sum of positive squares in only one way, i.e., 58616767881 + 96075201600 = 242109^2 + 309960^2 .

It is a tau number, because it is divible by the number of its divisors (63).

It is not a de Polignac number, because 154691969481 - 2³ = 154691969473 is a prime.

It is a super-2 number, since 2×154691969481² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (154691969281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 62 ways as a sum of consecutive naturals, for example, 74334361 + ... + 74336441.

Almost surely, 2^154691969481 is an apocalyptic number.

154691969481 is the 393309-th square number.

154691969481 is the 196655-th centered octagonal number.

It is an amenable number.

154691969481 is a deficient number, since it is larger than the sum of its proper divisors (115236022062).

154691969481 is an frugal number, since it uses more digits than its factorization.

154691969481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4194 (or 2091 counting only the distinct ones).

The product of its digits is 16796160, while the sum is 63.

The spelling of 154691969481 in words is "one hundred fifty-four billion, six hundred ninety-one million, nine hundred sixty-nine thousand, four hundred eighty-one".