1561151604 has 24 divisors (see below), whose sum is σ = 3643375680. Its totient is φ = 520285504.

The previous prime is 1561151569. The next prime is 1561151609. The reversal of 1561151604 is 4061511651.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1561151609) 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, 83992 + ... + 100880.

It is an arithmetic number, because the mean of its divisors is an integer number (151807320).

Almost surely, 2^1561151604 is an apocalyptic number.

It is an amenable number.

1561151604 is an abundant number, since it is smaller than the sum of its proper divisors (2082224076).

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

1561151604 is a wasteful number, since it uses less digits than its factorization.

1561151604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24599 (or 24597 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 30.

The square root of 1561151604 is about 39511.4110606037. The cubic root of 1561151604 is about 1160.0633150142.

The spelling of 1561151604 in words is "one billion, five hundred sixty-one million, one hundred fifty-one thousand, six hundred four".