22391251 has 2 divisors, whose sum is σ = 22391252. Its totient is φ = 22391250.

The previous prime is 22391221. The next prime is 22391263. The reversal of 22391251 is 15219322.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 22391251 - 2¹³ = 22383059 is a prime.

It is not a weakly prime, because it can be changed into another prime (22391221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11195625 + 11195626.

It is an arithmetic number, because the mean of its divisors is an integer number (11195626).

Almost surely, 2^22391251 is an apocalyptic number.

22391251 is a deficient number, since it is larger than the sum of its proper divisors (1).

22391251 is an equidigital number, since it uses as much as digits as its factorization.

22391251 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1080, while the sum is 25.

The square root of 22391251 is about 4731.9394543887. The cubic root of 22391251 is about 281.8552440173.

The spelling of 22391251 in words is "twenty-two million, three hundred ninety-one thousand, two hundred fifty-one".