1540213131 has 16 divisors (see below), whose sum is σ = 2165990400. Its totient is φ = 970836768.

The previous prime is 1540213127. The next prime is 1540213163. The reversal of 1540213131 is 1313120451.

It is not a de Polignac number, because 1540213131 - 2² = 1540213127 is a prime.

It is a super-2 number, since 2×1540213131² = 4744512977809646322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1540213098 and 1540213107.

It is not an unprimeable number, because it can be changed into a prime (1540213121) 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, 2470 + ... + 55556.

It is an arithmetic number, because the mean of its divisors is an integer number (135374400).

Almost surely, 2^1540213131 is an apocalyptic number.

1540213131 is a deficient number, since it is larger than the sum of its proper divisors (625777269).

1540213131 is a wasteful number, since it uses less digits than its factorization.

1540213131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53618.

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 1540213131 is about 39245.5491871371. The cubic root of 1540213131 is about 1154.8536213738.

Adding to 1540213131 its reverse (1313120451), we get a palindrome (2853333582).

The spelling of 1540213131 in words is "one billion, five hundred forty million, two hundred thirteen thousand, one hundred thirty-one".