15722251 has 2 divisors, whose sum is σ = 15722252. Its totient is φ = 15722250.

The previous prime is 15722237. The next prime is 15722279. The reversal of 15722251 is 15222751.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 15722251 - 2¹¹ = 15720203 is a prime.

It is not a weakly prime, because it can be changed into another prime (15722221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7861125 + 7861126.

It is an arithmetic number, because the mean of its divisors is an integer number (7861126).

Almost surely, 2^15722251 is an apocalyptic number.

15722251 is a deficient number, since it is larger than the sum of its proper divisors (1).

15722251 is an equidigital number, since it uses as much as digits as its factorization.

15722251 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1400, while the sum is 25.

The square root of 15722251 is about 3965.1293799824. The cubic root of 15722251 is about 250.5175996229.

Subtracting from 15722251 its reverse (15222751), we obtain a triangular number (499500 = T₉₉₉).

The spelling of 15722251 in words is "fifteen million, seven hundred twenty-two thousand, two hundred fifty-one".