1561060251 has 48 divisors (see below), whose sum is σ = 2353867776. Its totient is φ = 996323328.

The previous prime is 1561060247. The next prime is 1561060279. The reversal of 1561060251 is 1520601651.

It is a happy number.

1561060251 is a `hidden beast` number, since 1 + 5 + 6 + 1 + 0 + 602 + 51 = 666.

It is not a de Polignac number, because 1561060251 - 2² = 1561060247 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1561060231) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4422091 + ... + 4422443.

It is an arithmetic number, because the mean of its divisors is an integer number (49038912).

Almost surely, 2^1561060251 is an apocalyptic number.

1561060251 is a deficient number, since it is larger than the sum of its proper divisors (792807525).

1561060251 is a wasteful number, since it uses less digits than its factorization.

1561060251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 612 (or 609 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 27.

The square root of 1561060251 is about 39510.2550105666. The cubic root of 1561060251 is about 1160.0406869895.

The spelling of 1561060251 in words is "one billion, five hundred sixty-one million, sixty thousand, two hundred fifty-one".