91142237 has 4 divisors (see below), whose sum is σ = 91161660. Its totient is φ = 91122816.

The previous prime is 91142231. The next prime is 91142239. The reversal of 91142237 is 73224119.

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

It can be written as a sum of positive squares in 2 ways, for example, as 23145721 + 67996516 = 4811^2 + 8246^2 .

It is a cyclic number.

It is not a de Polignac number, because 91142237 - 2⁶ = 91142173 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 (91142231) 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, 2189 + ... + 13677.

It is an arithmetic number, because the mean of its divisors is an integer number (22790415).

Almost surely, 2^91142237 is an apocalyptic number.

It is an amenable number.

91142237 is a deficient number, since it is larger than the sum of its proper divisors (19423).

91142237 is a wasteful number, since it uses less digits than its factorization.

91142237 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19422.

The product of its digits is 3024, while the sum is 29.

The square root of 91142237 is about 9546.8443477413. The cubic root of 91142237 is about 450.0283718737.

The spelling of 91142237 in words is "ninety-one million, one hundred forty-two thousand, two hundred thirty-seven".