91139437 has 4 divisors (see below), whose sum is σ = 91163520. Its totient is φ = 91115356.

The previous prime is 91139407. The next prime is 91139441. The reversal of 91139437 is 73493119.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 91139437 - 2⁷ = 91139309 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 91139396 and 91139405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91139407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4987 + ... + 14392.

It is an arithmetic number, because the mean of its divisors is an integer number (22790880).

Almost surely, 2^91139437 is an apocalyptic number.

It is an amenable number.

91139437 is a deficient number, since it is larger than the sum of its proper divisors (24083).

91139437 is a wasteful number, since it uses less digits than its factorization.

91139437 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24082.

The product of its digits is 20412, while the sum is 37.

The square root of 91139437 is about 9546.6977012996. The cubic root of 91139437 is about 450.0237633541.

The spelling of 91139437 in words is "ninety-one million, one hundred thirty-nine thousand, four hundred thirty-seven".