1561403652 has 12 divisors (see below), whose sum is σ = 3643275216. Its totient is φ = 520467880.

The previous prime is 1561403651. The next prime is 1561403681. The reversal of 1561403652 is 2563041651.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (1561403651) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65058474 + ... + 65058497.

It is an arithmetic number, because the mean of its divisors is an integer number (303606268).

Almost surely, 2^1561403652 is an apocalyptic number.

1561403652 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1561403652 is an abundant number, since it is smaller than the sum of its proper divisors (2081871564).

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

1561403652 is a wasteful number, since it uses less digits than its factorization.

1561403652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130116978 (or 130116976 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 33.

The square root of 1561403652 is about 39514.6004914639. The cubic root of 1561403652 is about 1160.1257424136.

The spelling of 1561403652 in words is "one billion, five hundred sixty-one million, four hundred three thousand, six hundred fifty-two".