15220631 has 2 divisors, whose sum is σ = 15220632. Its totient is φ = 15220630.

The previous prime is 15220613. The next prime is 15220633. The reversal of 15220631 is 13602251.

Together with previous prime (15220613) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 15220631 - 2⁶ = 15220567 is a prime.

It is a super-2 number, since 2×15220631² = 463335216076322, which contains 22 as substring.

Together with 15220633, 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 (15220633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7610315 + 7610316.

It is an arithmetic number, because the mean of its divisors is an integer number (7610316).

Almost surely, 2^15220631 is an apocalyptic number.

15220631 is a deficient number, since it is larger than the sum of its proper divisors (1).

15220631 is an equidigital number, since it uses as much as digits as its factorization.

15220631 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 15220631 is about 3901.3627106436. The cubic root of 15220631 is about 247.8244888523.

Adding to 15220631 its reverse (13602251), we get a palindrome (28822882).

It can be divided in two parts, 15220 and 631, that added together give a palindrome (15851).

The spelling of 15220631 in words is "fifteen million, two hundred twenty thousand, six hundred thirty-one".