22951891 has 2 divisors, whose sum is σ = 22951892. Its totient is φ = 22951890.

The previous prime is 22951801. The next prime is 22951927. The reversal of 22951891 is 19815922.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 22951891 - 2⁷ = 22951763 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 22951891.

It is not a weakly prime, because it can be changed into another prime (22951801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11475945 + 11475946.

It is an arithmetic number, because the mean of its divisors is an integer number (11475946).

Almost surely, 2^22951891 is an apocalyptic number.

22951891 is a deficient number, since it is larger than the sum of its proper divisors (1).

22951891 is an equidigital number, since it uses as much as digits as its factorization.

22951891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12960, while the sum is 37.

The square root of 22951891 is about 4790.8131877584. The cubic root of 22951891 is about 284.1882761015.

It can be divided in two parts, 2295 and 1891, that added together give a triangular number (4186 = T₉₁).

The spelling of 22951891 in words is "twenty-two million, nine hundred fifty-one thousand, eight hundred ninety-one".