1337988521 has 2 divisors, whose sum is σ = 1337988522. Its totient is φ = 1337988520.

The previous prime is 1337988503. The next prime is 1337988523. The reversal of 1337988521 is 1258897331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1335098521 + 2890000 = 36539^2 + 1700^2 .

It is a cyclic number.

It is not a de Polignac number, because 1337988521 - 2¹⁴ = 1337972137 is a prime.

Together with 1337988523, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1337988523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 668994260 + 668994261.

It is an arithmetic number, because the mean of its divisors is an integer number (668994261).

Almost surely, 2^1337988521 is an apocalyptic number.

It is an amenable number.

1337988521 is a deficient number, since it is larger than the sum of its proper divisors (1).

1337988521 is an equidigital number, since it uses as much as digits as its factorization.

1337988521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 362880, while the sum is 47.

The square root of 1337988521 is about 36578.5254076760. The cubic root of 1337988521 is about 1101.9218526978.

The spelling of 1337988521 in words is "one billion, three hundred thirty-seven million, nine hundred eighty-eight thousand, five hundred twenty-one".