39714909781 has 2 divisors, whose sum is σ = 39714909782. Its totient is φ = 39714909780.

The previous prime is 39714909757. The next prime is 39714909799. The reversal of 39714909781 is 18790941793.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24840912100 + 14873997681 = 157610^2 + 121959^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-39714909781 is a prime.

It is a super-2 number, since 2×39714909781² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39714909701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19857454890 + 19857454891.

It is an arithmetic number, because the mean of its divisors is an integer number (19857454891).

Almost surely, 2^39714909781 is an apocalyptic number.

It is an amenable number.

39714909781 is a deficient number, since it is larger than the sum of its proper divisors (1).

39714909781 is an equidigital number, since it uses as much as digits as its factorization.

39714909781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3429216, while the sum is 58.

The spelling of 39714909781 in words is "thirty-nine billion, seven hundred fourteen million, nine hundred nine thousand, seven hundred eighty-one".