3721931 has 2 divisors, whose sum is σ = 3721932. Its totient is φ = 3721930.

The previous prime is 3721919. The next prime is 3721933. The reversal of 3721931 is 1391273.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 3721931 - 2¹⁰ = 3720907 is a prime.

It is a super-2 number, since 2×3721931² = 27705540737522, which contains 22 as substring.

Together with 3721933, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 3721931.

It is not a weakly prime, because it can be changed into another prime (3721933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1860965 + 1860966.

It is an arithmetic number, because the mean of its divisors is an integer number (1860966).

Almost surely, 2^3721931 is an apocalyptic number.

3721931 is a deficient number, since it is larger than the sum of its proper divisors (1).

3721931 is an equidigital number, since it uses as much as digits as its factorization.

3721931 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1134, while the sum is 26.

The square root of 3721931 is about 1929.2306756840. The cubic root of 3721931 is about 154.9730234009.

The spelling of 3721931 in words is "three million, seven hundred twenty-one thousand, nine hundred thirty-one".