23551691 has 2 divisors, whose sum is σ = 23551692. Its totient is φ = 23551690.

The previous prime is 23551669. The next prime is 23551709. The reversal of 23551691 is 19615532.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 23551691 - 2¹⁴ = 23535307 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (23551601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11775845 + 11775846.

It is an arithmetic number, because the mean of its divisors is an integer number (11775846).

Almost surely, 2^23551691 is an apocalyptic number.

23551691 is a deficient number, since it is larger than the sum of its proper divisors (1).

23551691 is an equidigital number, since it uses as much as digits as its factorization.

23551691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8100, while the sum is 32.

The square root of 23551691 is about 4853.0084483751. The cubic root of 23551691 is about 286.6425760959.

It can be divided in two parts, 23551 and 691, that added together give a palindrome (24242).

The spelling of 23551691 in words is "twenty-three million, five hundred fifty-one thousand, six hundred ninety-one".