155461631 has 16 divisors (see below), whose sum is σ = 169814400. Its totient is φ = 141468768.

The previous prime is 155461517. The next prime is 155461639. The reversal of 155461631 is 136164551.

It is a cyclic number.

It is not a de Polignac number, because 155461631 - 2¹⁸ = 155199487 is a prime.

It is a super-2 number, since 2×155461631² = 48336637426360322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155461639) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 410000 + ... + 410378.

It is an arithmetic number, because the mean of its divisors is an integer number (10613400).

Almost surely, 2^155461631 is an apocalyptic number.

155461631 is a deficient number, since it is larger than the sum of its proper divisors (14352769).

155461631 is a wasteful number, since it uses less digits than its factorization.

155461631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 758.

The product of its digits is 10800, while the sum is 32.

The square root of 155461631 is about 12468.4253616886. The cubic root of 155461631 is about 537.7012836185.

The spelling of 155461631 in words is "one hundred fifty-five million, four hundred sixty-one thousand, six hundred thirty-one".