3991814377 has 2 divisors, whose sum is σ = 3991814378. Its totient is φ = 3991814376.

The previous prime is 3991814341. The next prime is 3991814423. The reversal of 3991814377 is 7734181993.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3413363776 + 578450601 = 58424^2 + 24051^2 .

It is a cyclic number.

It is not a de Polignac number, because 3991814377 - 2¹⁵ = 3991781609 is a prime.

It is not a weakly prime, because it can be changed into another prime (3991814777) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1995907188 + 1995907189.

It is an arithmetic number, because the mean of its divisors is an integer number (1995907189).

Almost surely, 2^3991814377 is an apocalyptic number.

It is an amenable number.

3991814377 is a deficient number, since it is larger than the sum of its proper divisors (1).

3991814377 is an equidigital number, since it uses as much as digits as its factorization.

3991814377 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1143072, while the sum is 52.

The square root of 3991814377 is about 63180.8070303000. The cubic root of 3991814377 is about 1586.3174902827.

The spelling of 3991814377 in words is "three billion, nine hundred ninety-one million, eight hundred fourteen thousand, three hundred seventy-seven".