109236991 has 2 divisors, whose sum is σ = 109236992. Its totient is φ = 109236990.

The previous prime is 109236983. The next prime is 109237003. The reversal of 109236991 is 199632901.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 109236991 - 2³ = 109236983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (109236091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54618495 + 54618496.

It is an arithmetic number, because the mean of its divisors is an integer number (54618496).

Almost surely, 2^109236991 is an apocalyptic number.

109236991 is a deficient number, since it is larger than the sum of its proper divisors (1).

109236991 is an equidigital number, since it uses as much as digits as its factorization.

109236991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 26244, while the sum is 40.

The square root of 109236991 is about 10451.6501567934. The cubic root of 109236991 is about 478.0315668654.

It can be divided in two parts, 1092 and 36991, that added together give a palindrome (38083).

The spelling of 109236991 in words is "one hundred nine million, two hundred thirty-six thousand, nine hundred ninety-one".