1561379546 has 32 divisors (see below), whose sum is σ = 2474841600. Its totient is φ = 737714880.

The previous prime is 1561379537. The next prime is 1561379551. The reversal of 1561379546 is 6459731651.

It is a super-2 number, since 2×1561379546² = 4875812173334332232, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1561379546.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 787985 + ... + 789963.

It is an arithmetic number, because the mean of its divisors is an integer number (77338800).

Almost surely, 2^1561379546 is an apocalyptic number.

1561379546 is a deficient number, since it is larger than the sum of its proper divisors (913462054).

1561379546 is a wasteful number, since it uses less digits than its factorization.

1561379546 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2294.

The product of its digits is 680400, while the sum is 47.

The square root of 1561379546 is about 39514.2954637939. The cubic root of 1561379546 is about 1160.1197721156.

It can be divided in two parts, 15613 and 79546, that added together give a palindrome (95159).

The spelling of 1561379546 in words is "one billion, five hundred sixty-one million, three hundred seventy-nine thousand, five hundred forty-six".