22691391 has 8 divisors (see below), whose sum is σ = 30305664. Its totient is φ = 15102360.

The previous prime is 22691353. The next prime is 22691399. The reversal of 22691391 is 19319622.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-22691391 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22691399) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4101 + ... + 7886.

It is an arithmetic number, because the mean of its divisors is an integer number (3788208).

Almost surely, 2^22691391 is an apocalyptic number.

22691391 is a deficient number, since it is larger than the sum of its proper divisors (7614273).

22691391 is a wasteful number, since it uses less digits than its factorization.

22691391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12621.

The product of its digits is 5832, while the sum is 33.

The square root of 22691391 is about 4763.5481523755. The cubic root of 22691391 is about 283.1090199987.

The spelling of 22691391 in words is "twenty-two million, six hundred ninety-one thousand, three hundred ninety-one".