39315514921 has 2 divisors, whose sum is σ = 39315514922. Its totient is φ = 39315514920.

The previous prime is 39315514891. The next prime is 39315514969. The reversal of 39315514921 is 12941551393.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25524535696 + 13790979225 = 159764^2 + 117435^2 .

It is a cyclic number.

It is not a de Polignac number, because 39315514921 - 2⁷ = 39315514793 is a prime.

It is not a weakly prime, because it can be changed into another prime (39315514981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19657757460 + 19657757461.

It is an arithmetic number, because the mean of its divisors is an integer number (19657757461).

Almost surely, 2^39315514921 is an apocalyptic number.

It is an amenable number.

39315514921 is a deficient number, since it is larger than the sum of its proper divisors (1).

39315514921 is an equidigital number, since it uses as much as digits as its factorization.

39315514921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 145800, while the sum is 43.

The spelling of 39315514921 in words is "thirty-nine billion, three hundred fifteen million, five hundred fourteen thousand, nine hundred twenty-one".