154778481 has 81 divisors (see below), whose sum is σ = 275590497. Its totient is φ = 83603520.

The previous prime is 154778479. The next prime is 154778501. The reversal of 154778481 is 184877451.

The square root of 154778481 is 12441.

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

It can be written as a sum of positive squares in 4 ways, for example, as 19847025 + 134931456 = 4455^2 + 11616^2 .

It is not a de Polignac number, because 154778481 - 2¹ = 154778479 is a prime.

It is a super-2 number, since 2×154778481² = 47912756361334722, which contains 22 as substring.

Its product of digits (250880) is a multiple of the sum of its prime divisors (56).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (154778461) by changing a digit.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 5337175 + ... + 5337203.

Almost surely, 2^154778481 is an apocalyptic number.

154778481 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

154778481 is the 12441-st square number.

154778481 is the 6221-st centered octagonal number.

It is an amenable number.

154778481 is a deficient number, since it is larger than the sum of its proper divisors (120812016).

154778481 is a wasteful number, since it uses less digits than its factorization.

154778481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112 (or 56 counting only the distinct ones).

The product of its digits is 250880, while the sum is 45.

The cubic root of 154778481 is about 536.9125144873.

The spelling of 154778481 in words is "one hundred fifty-four million, seven hundred seventy-eight thousand, four hundred eighty-one".