1373379561 has 24 divisors (see below), whose sum is σ = 2120118624. Its totient is φ = 853664640.

The previous prime is 1373379551. The next prime is 1373379569. The reversal of 1373379561 is 1659733731.

1373379561 is a `hidden beast` number, since 13 + 7 + 3 + 3 + 79 + 561 = 666.

It is not a de Polignac number, because 1373379561 - 2¹⁰ = 1373378537 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1373379569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 25575 + ... + 58316.

It is an arithmetic number, because the mean of its divisors is an integer number (88338276).

Almost surely, 2^1373379561 is an apocalyptic number.

It is an amenable number.

1373379561 is a deficient number, since it is larger than the sum of its proper divisors (746739063).

1373379561 is a wasteful number, since it uses less digits than its factorization.

1373379561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84021 (or 84018 counting only the distinct ones).

The product of its digits is 357210, while the sum is 45.

The square root of 1373379561 is about 37059.1359991028. The cubic root of 1373379561 is about 1111.5530464113.

The spelling of 1373379561 in words is "one billion, three hundred seventy-three million, three hundred seventy-nine thousand, five hundred sixty-one".