15222491 has 2 divisors, whose sum is σ = 15222492. Its totient is φ = 15222490.

The previous prime is 15222479. The next prime is 15222499. The reversal of 15222491 is 19422251.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 15222491 - 2¹⁸ = 14960347 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 15222491.

It is not a weakly prime, because it can be changed into another prime (15222499) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7611245 + 7611246.

It is an arithmetic number, because the mean of its divisors is an integer number (7611246).

Almost surely, 2^15222491 is an apocalyptic number.

15222491 is a deficient number, since it is larger than the sum of its proper divisors (1).

15222491 is an equidigital number, since it uses as much as digits as its factorization.

15222491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1440, while the sum is 26.

The square root of 15222491 is about 3901.6010816074. The cubic root of 15222491 is about 247.8345833697.

The spelling of 15222491 in words is "fifteen million, two hundred twenty-two thousand, four hundred ninety-one".