11503431051 has 24 divisors (see below), whose sum is σ = 18417613824. Its totient is φ = 6361341840.

The previous prime is 11503431011. The next prime is 11503431053. The reversal of 11503431051 is 15013430511.

It is not a de Polignac number, because 11503431051 - 2⁷ = 11503430923 is a prime.

It is a super-2 number, since 2×11503431051² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (11503431053) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1257615 + ... + 1266728.

It is an arithmetic number, because the mean of its divisors is an integer number (767400576).

Almost surely, 2^11503431051 is an apocalyptic number.

11503431051 is a deficient number, since it is larger than the sum of its proper divisors (6914182773).

11503431051 is a wasteful number, since it uses less digits than its factorization.

11503431051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2524391 (or 2524384 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 24.

Adding to 11503431051 its reverse (15013430511), we get a palindrome (26516861562).

The spelling of 11503431051 in words is "eleven billion, five hundred three million, four hundred thirty-one thousand, fifty-one".