3991914977 has 2 divisors, whose sum is σ = 3991914978. Its totient is φ = 3991914976.

The previous prime is 3991914961. The next prime is 3991915001. The reversal of 3991914977 is 7794191993.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2516125921 + 1475789056 = 50161^2 + 38416^2 .

It is a cyclic number.

It is not a de Polignac number, because 3991914977 - 2⁴ = 3991914961 is a prime.

It is not a weakly prime, because it can be changed into another prime (3991914907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1995957488 + 1995957489.

It is an arithmetic number, because the mean of its divisors is an integer number (1995957489).

Almost surely, 2^3991914977 is an apocalyptic number.

It is an amenable number.

3991914977 is a deficient number, since it is larger than the sum of its proper divisors (1).

3991914977 is an equidigital number, since it uses as much as digits as its factorization.

3991914977 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3857868, while the sum is 59.

The square root of 3991914977 is about 63181.6031531331. The cubic root of 3991914977 is about 1586.3308160692.

The spelling of 3991914977 in words is "three billion, nine hundred ninety-one million, nine hundred fourteen thousand, nine hundred seventy-seven".