1125515531 has 8 divisors (see below), whose sum is σ = 1290441984. Its totient is φ = 961623720.

The previous prime is 1125515527. The next prime is 1125515563. The reversal of 1125515531 is 1355155211.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1125515531 - 2² = 1125515527 is a prime.

It is a super-2 number, since 2×1125515531² = 2533570421044423922, 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 = 1125515494 and 1125515503.

It is not an unprimeable number, because it can be changed into a prime (1125515581) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 256325 + ... + 260678.

It is an arithmetic number, because the mean of its divisors is an integer number (161305248).

Almost surely, 2^1125515531 is an apocalyptic number.

1125515531 is a deficient number, since it is larger than the sum of its proper divisors (164926453).

1125515531 is an equidigital number, since it uses as much as digits as its factorization.

1125515531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 517321.

The product of its digits is 3750, while the sum is 29.

The square root of 1125515531 is about 33548.7038646801. The cubic root of 1125515531 is about 1040.2007535903.

The spelling of 1125515531 in words is "one billion, one hundred twenty-five million, five hundred fifteen thousand, five hundred thirty-one".