3949685137 has 2 divisors, whose sum is σ = 3949685138. Its totient is φ = 3949685136.

The previous prime is 3949685119. The next prime is 3949685161. The reversal of 3949685137 is 7315869493.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3831114816 + 118570321 = 61896^2 + 10889^2 .

It is an emirp because it is prime and its reverse (7315869493) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3949685137 - 2⁷ = 3949685009 is a prime.

It is not a weakly prime, because it can be changed into another prime (3949682137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1974842568 + 1974842569.

It is an arithmetic number, because the mean of its divisors is an integer number (1974842569).

Almost surely, 2^3949685137 is an apocalyptic number.

It is an amenable number.

3949685137 is a deficient number, since it is larger than the sum of its proper divisors (1).

3949685137 is an equidigital number, since it uses as much as digits as its factorization.

3949685137 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4898880, while the sum is 55.

The square root of 3949685137 is about 62846.5204844310. The cubic root of 3949685137 is about 1580.7171258604.

The spelling of 3949685137 in words is "three billion, nine hundred forty-nine million, six hundred eighty-five thousand, one hundred thirty-seven".