11513031000 has 512 divisors, whose sum is σ = 39949977600. Its totient is φ = 2749593600.

The previous prime is 11513030957. The next prime is 11513031043. The reversal of 11513031000 is 13031511.

It is an interprime number because it is at equal distance from previous prime (11513030957) and next prime (11513031043).

It is a super-2 number, since 2×11513031000² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 111776949 + ... + 111777051.

It is an arithmetic number, because the mean of its divisors is an integer number (78027300).

Almost surely, 2^11513031000 is an apocalyptic number.

11513031000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11513031000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19974988800).

11513031000 is an abundant number, since it is smaller than the sum of its proper divisors (28436946600).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11513031000 is a wasteful number, since it uses less digits than its factorization.

11513031000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236 (or 222 counting only the distinct ones).

The product of its (nonzero) digits is 45, while the sum is 15.

Adding to 11513031000 its reverse (13031511), we get a palindrome (11526062511).

The spelling of 11513031000 in words is "eleven billion, five hundred thirteen million, thirty-one thousand".