154071681 has 4 divisors (see below), whose sum is σ = 205428912. Its totient is φ = 102714452.

The previous prime is 154071679. The next prime is 154071713. The reversal of 154071681 is 186170451.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 154071681 - 2¹ = 154071679 is a prime.

It is a super-2 number, since 2×154071681² = 47476165772331522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (154071611) 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 3 ways as a sum of consecutive naturals, for example, 25678611 + ... + 25678616.

It is an arithmetic number, because the mean of its divisors is an integer number (51357228).

Almost surely, 2^154071681 is an apocalyptic number.

It is an amenable number.

154071681 is a deficient number, since it is larger than the sum of its proper divisors (51357231).

154071681 is an equidigital number, since it uses as much as digits as its factorization.

154071681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51357230.

The product of its (nonzero) digits is 6720, while the sum is 33.

The square root of 154071681 is about 12412.5614197876. The cubic root of 154071681 is about 536.0939922510.

The spelling of 154071681 in words is "one hundred fifty-four million, seventy-one thousand, six hundred eighty-one".