23091156 has 180 divisors, whose sum is σ = 72096640. Its totient is φ = 6415200.

The previous prime is 23091143. The next prime is 23091157. The reversal of 23091156 is 65119032.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23091157) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 744861 + ... + 744891.

Almost surely, 2^23091156 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 23091156, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36048320).

23091156 is an abundant number, since it is smaller than the sum of its proper divisors (49005484).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

23091156 is a wasteful number, since it uses less digits than its factorization.

23091156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88 (or 66 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 27.

The square root of 23091156 is about 4805.3257954066. The cubic root of 23091156 is about 284.7619064113.

The spelling of 23091156 in words is "twenty-three million, ninety-one thousand, one hundred fifty-six".