155638461 has 32 divisors (see below), whose sum is σ = 231469056. Its totient is φ = 92232000.

The previous prime is 155638433. The next prime is 155638477. The reversal of 155638461 is 164836551.

It is not a de Polignac number, because 155638461 - 2²⁵ = 122084029 is a prime.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155638421) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 423900 + ... + 424266.

It is an arithmetic number, because the mean of its divisors is an integer number (7233408).

Almost surely, 2^155638461 is an apocalyptic number.

155638461 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

155638461 is a deficient number, since it is larger than the sum of its proper divisors (75830595).

155638461 is a wasteful number, since it uses less digits than its factorization.

155638461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 633.

The product of its digits is 86400, while the sum is 39.

The square root of 155638461 is about 12475.5144583300. The cubic root of 155638461 is about 537.9050760053.

The spelling of 155638461 in words is "one hundred fifty-five million, six hundred thirty-eight thousand, four hundred sixty-one".