3115621 has 2 divisors, whose sum is σ = 3115622. Its totient is φ = 3115620.

The previous prime is 3115597. The next prime is 3115627. The reversal of 3115621 is 1265113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2772225 + 343396 = 1665^2 + 586^2 .

It is an emirp because it is prime and its reverse (1265113) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3115621 - 2⁷ = 3115493 is a prime.

It is equal to p₂₂₄₅₄₂ and since 3115621 and 224542 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3115627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1557810 + 1557811.

It is an arithmetic number, because the mean of its divisors is an integer number (1557811).

Almost surely, 2^3115621 is an apocalyptic number.

It is an amenable number.

3115621 is a deficient number, since it is larger than the sum of its proper divisors (1).

3115621 is an equidigital number, since it uses as much as digits as its factorization.

3115621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 180, while the sum is 19.

The square root of 3115621 is about 1765.1121777383. The cubic root of 3115621 is about 146.0544770745.

The spelling of 3115621 in words is "three million, one hundred fifteen thousand, six hundred twenty-one".