1538731131 has 16 divisors (see below), whose sum is σ = 2468140800. Its totient is φ = 832997088.

The previous prime is 1538731127. The next prime is 1538731141. The reversal of 1538731131 is 1311378351.

It is not a de Polignac number, because 1538731131 - 2² = 1538731127 is a prime.

It is a super-2 number, since 2×1538731131² = 4735386987017078322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1538731092 and 1538731101.

It is not an unprimeable number, because it can be changed into a prime (1538731141) 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, 1927836 + ... + 1928633.

It is an arithmetic number, because the mean of its divisors is an integer number (154258800).

Almost surely, 2^1538731131 is an apocalyptic number.

1538731131 is a deficient number, since it is larger than the sum of its proper divisors (929409669).

1538731131 is a wasteful number, since it uses less digits than its factorization.

1538731131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3856498.

The product of its digits is 7560, while the sum is 33.

The square root of 1538731131 is about 39226.6635211306. The cubic root of 1538731131 is about 1154.4831007271.

The spelling of 1538731131 in words is "one billion, five hundred thirty-eight million, seven hundred thirty-one thousand, one hundred thirty-one".