1540439131 has 16 divisors (see below), whose sum is σ = 1922323968. Its totient is φ = 1199232000.

The previous prime is 1540439123. The next prime is 1540439149. The reversal of 1540439131 is 1319340451.

It is a cyclic number.

It is not a de Polignac number, because 1540439131 - 2³ = 1540439123 is a prime.

It is a super-2 number, since 2×1540439131² = 4745905432632070322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1540439093 and 1540439102.

It is not an unprimeable number, because it can be changed into a prime (1540439171) 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, 80106 + ... + 97456.

It is an arithmetic number, because the mean of its divisors is an integer number (120145248).

Almost surely, 2^1540439131 is an apocalyptic number.

1540439131 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1540439131 is a deficient number, since it is larger than the sum of its proper divisors (381884837).

1540439131 is a wasteful number, since it uses less digits than its factorization.

1540439131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18522.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 1540439131 is about 39248.4283889177. The cubic root of 1540439131 is about 1154.9101036334.

Adding to 1540439131 its reverse (1319340451), we get a palindrome (2859779582).

The spelling of 1540439131 in words is "one billion, five hundred forty million, four hundred thirty-nine thousand, one hundred thirty-one".