39777909121 has 2 divisors, whose sum is σ = 39777909122. Its totient is φ = 39777909120.

The previous prime is 39777909053. The next prime is 39777909137. The reversal of 39777909121 is 12190977793.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 34507149121 + 5270760000 = 185761^2 + 72600^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-39777909121 is a prime.

It is not a weakly prime, because it can be changed into another prime (39777909151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19888954560 + 19888954561.

It is an arithmetic number, because the mean of its divisors is an integer number (19888954561).

Almost surely, 2^39777909121 is an apocalyptic number.

It is an amenable number.

39777909121 is a deficient number, since it is larger than the sum of its proper divisors (1).

39777909121 is an equidigital number, since it uses as much as digits as its factorization.

39777909121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1500282, while the sum is 55.

The spelling of 39777909121 in words is "thirty-nine billion, seven hundred seventy-seven million, nine hundred nine thousand, one hundred twenty-one".