22951991 has 4 divisors (see below), whose sum is σ = 22962000. Its totient is φ = 22941984.

The previous prime is 22951969. The next prime is 22951993. The reversal of 22951991 is 19915922.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 22951991 - 2⁶ = 22951927 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22951993) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 335 + ... + 6783.

It is an arithmetic number, because the mean of its divisors is an integer number (5740500).

Almost surely, 2^22951991 is an apocalyptic number.

22951991 is a deficient number, since it is larger than the sum of its proper divisors (10009).

22951991 is an equidigital number, since it uses as much as digits as its factorization.

22951991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10008.

The product of its digits is 14580, while the sum is 38.

The square root of 22951991 is about 4790.8236243886. The cubic root of 22951991 is about 284.1886888313.

The spelling of 22951991 in words is "twenty-two million, nine hundred fifty-one thousand, nine hundred ninety-one".