1121640531 has 16 divisors (see below), whose sum is σ = 1632355200. Its totient is φ = 679416320.

The previous prime is 1121640523. The next prime is 1121640577. The reversal of 1121640531 is 1350461211.

It is a happy number.

It is not a de Polignac number, because 1121640531 - 2³ = 1121640523 is a prime.

It is a super-3 number, since 3×1121640531³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (1121640521) 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, 61171 + ... + 77363.

It is an arithmetic number, because the mean of its divisors is an integer number (102022200).

Almost surely, 2^1121640531 is an apocalyptic number.

1121640531 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1121640531 is a deficient number, since it is larger than the sum of its proper divisors (510714669).

1121640531 is a wasteful number, since it uses less digits than its factorization.

1121640531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18306.

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 1121640531 is about 33490.9022123919. The cubic root of 1121640531 is about 1039.0056234513.

The spelling of 1121640531 in words is "one billion, one hundred twenty-one million, six hundred forty thousand, five hundred thirty-one".