11922591 has 4 divisors (see below), whose sum is σ = 15896792. Its totient is φ = 7948392.

The previous prime is 11922571. The next prime is 11922611. The reversal of 11922591 is 19522911.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (11922571) and next prime (11922611).

It is not a de Polignac number, because 11922591 - 2⁶ = 11922527 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 (11922541) 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, 1987096 + ... + 1987101.

It is an arithmetic number, because the mean of its divisors is an integer number (3974198).

Almost surely, 2^11922591 is an apocalyptic number.

11922591 is a deficient number, since it is larger than the sum of its proper divisors (3974201).

11922591 is an equidigital number, since it uses as much as digits as its factorization.

11922591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3974200.

The product of its digits is 1620, while the sum is 30.

The square root of 11922591 is about 3452.9105114381. The cubic root of 11922591 is about 228.4495018063.

It can be divided in two parts, 119225 and 91, that added together give a triangular number (119316 = T₄₈₈).

The spelling of 11922591 in words is "eleven million, nine hundred twenty-two thousand, five hundred ninety-one".