3951557 has 2 divisors, whose sum is σ = 3951558. Its totient is φ = 3951556.

The previous prime is 3951553. The next prime is 3951559. The reversal of 3951557 is 7551593.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3094081 + 857476 = 1759^2 + 926^2 .

It is a cyclic number.

It is not a de Polignac number, because 3951557 - 2² = 3951553 is a prime.

It is a super-2 number, since 2×3951557² = 31229605448498, which contains 22 as substring.

Together with 3951559, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3951551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1975778 + 1975779.

It is an arithmetic number, because the mean of its divisors is an integer number (1975779).

Almost surely, 2^3951557 is an apocalyptic number.

It is an amenable number.

3951557 is a deficient number, since it is larger than the sum of its proper divisors (1).

3951557 is an equidigital number, since it uses as much as digits as its factorization.

3951557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23625, while the sum is 35.

The square root of 3951557 is about 1987.8523587027. The cubic root of 3951557 is about 158.0966801340.

The spelling of 3951557 in words is "three million, nine hundred fifty-one thousand, five hundred fifty-seven".