1011561516 has 36 divisors (see below), whose sum is σ = 2922289552. Its totient is φ = 289017504.

The previous prime is 1011561497. The next prime is 1011561517. The reversal of 1011561516 is 6151651101.

It is a tau number, because it is divible by the number of its divisors (36).

It is a self number, because there is not a number n which added to its sum of digits gives 1011561516.

It is not an unprimeable number, because it can be changed into a prime (1011561517) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2006815 + ... + 2007318.

Almost surely, 2^1011561516 is an apocalyptic number.

It is an amenable number.

1011561516 is an abundant number, since it is smaller than the sum of its proper divisors (1910728036).

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

1011561516 is a wasteful number, since it uses less digits than its factorization.

1011561516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4014150 (or 4014145 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 27.

The square root of 1011561516 is about 31805.0548812606. The cubic root of 1011561516 is about 1003.8390812609.

It can be divided in two parts, 10115 and 61516, that added together give a triangular number (71631 = T₃₇₈).

The spelling of 1011561516 in words is "one billion, eleven million, five hundred sixty-one thousand, five hundred sixteen".