1373606521 has 4 divisors (see below), whose sum is σ = 1569836032. Its totient is φ = 1177377012.

The previous prime is 1373606513. The next prime is 1373606543. The reversal of 1373606521 is 1256063731.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1373606521 - 2³ = 1373606513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1373606021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 98114745 + ... + 98114758.

It is an arithmetic number, because the mean of its divisors is an integer number (392459008).

Almost surely, 2^1373606521 is an apocalyptic number.

It is an amenable number.

1373606521 is a deficient number, since it is larger than the sum of its proper divisors (196229511).

1373606521 is an equidigital number, since it uses as much as digits as its factorization.

1373606521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196229510.

The product of its (nonzero) digits is 22680, while the sum is 34.

The square root of 1373606521 is about 37062.1980055150. The cubic root of 1373606521 is about 1111.6142735212.

The spelling of 1373606521 in words is "one billion, three hundred seventy-three million, six hundred six thousand, five hundred twenty-one".