1379502521 has 2 divisors, whose sum is σ = 1379502522. Its totient is φ = 1379502520.

The previous prime is 1379502517. The next prime is 1379502539. The reversal of 1379502521 is 1252059731.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 880605625 + 498896896 = 29675^2 + 22336^2 .

It is a cyclic number.

It is not a de Polignac number, because 1379502521 - 2² = 1379502517 is a prime.

It is not a weakly prime, because it can be changed into another prime (1379502571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 689751260 + 689751261.

It is an arithmetic number, because the mean of its divisors is an integer number (689751261).

Almost surely, 2^1379502521 is an apocalyptic number.

It is an amenable number.

1379502521 is a deficient number, since it is larger than the sum of its proper divisors (1).

1379502521 is an equidigital number, since it uses as much as digits as its factorization.

1379502521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18900, while the sum is 35.

The square root of 1379502521 is about 37141.6547961988. The cubic root of 1379502521 is about 1113.2024824901.

The spelling of 1379502521 in words is "one billion, three hundred seventy-nine million, five hundred two thousand, five hundred twenty-one".