138631552 has 16 divisors (see below), whose sum is σ = 276180300. Its totient is φ = 69315712.

The previous prime is 138631499. The next prime is 138631553. The reversal of 138631552 is 255136831.

It is a tau number, because it is divible by the number of its divisors (16).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138631553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 541402 + ... + 541657.

Almost surely, 2^138631552 is an apocalyptic number.

It is an amenable number.

138631552 is a deficient number, since it is larger than the sum of its proper divisors (137548748).

138631552 is an equidigital number, since it uses as much as digits as its factorization.

138631552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1083073 (or 1083061 counting only the distinct ones).

The product of its digits is 21600, while the sum is 34.

The square root of 138631552 is about 11774.1900783026. The cubic root of 138631552 is about 517.5520443663.

The spelling of 138631552 in words is "one hundred thirty-eight million, six hundred thirty-one thousand, five hundred fifty-two".