3945997031 has 2 divisors, whose sum is σ = 3945997032. Its totient is φ = 3945997030.

The previous prime is 3945997009. The next prime is 3945997043. The reversal of 3945997031 is 1307995493.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 3945997031 - 2¹⁸ = 3945734887 is a prime.

It is a super-2 number, since 2×3945997031² = 31141785137321629922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3945997091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1972998515 + 1972998516.

It is an arithmetic number, because the mean of its divisors is an integer number (1972998516).

Almost surely, 2^3945997031 is an apocalyptic number.

3945997031 is a deficient number, since it is larger than the sum of its proper divisors (1).

3945997031 is an equidigital number, since it uses as much as digits as its factorization.

3945997031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 918540, while the sum is 50.

The square root of 3945997031 is about 62817.1714660888. The cubic root of 3945997031 is about 1580.2249627604.

The spelling of 3945997031 in words is "three billion, nine hundred forty-five million, nine hundred ninety-seven thousand, thirty-one".