1561133679 has 12 divisors (see below), whose sum is σ = 2421350424. Its totient is φ = 892076304.

The previous prime is 1561133663. The next prime is 1561133683. The reversal of 1561133679 is 9763311651.

It is not a de Polignac number, because 1561133679 - 2⁴ = 1561133663 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1561133679.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1561143679) 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, 5309832 + ... + 5310125.

It is an arithmetic number, because the mean of its divisors is an integer number (201779202).

Almost surely, 2^1561133679 is an apocalyptic number.

1561133679 is a deficient number, since it is larger than the sum of its proper divisors (860216745).

1561133679 is a wasteful number, since it uses less digits than its factorization.

1561133679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10619974 (or 10619967 counting only the distinct ones).

The product of its digits is 102060, while the sum is 42.

The square root of 1561133679 is about 39511.1842267477. The cubic root of 1561133679 is about 1160.0588750835.

The spelling of 1561133679 in words is "one billion, five hundred sixty-one million, one hundred thirty-three thousand, six hundred seventy-nine".