91250761 has 4 divisors (see below), whose sum is σ = 104286592. Its totient is φ = 78214932.

The previous prime is 91250759. The next prime is 91250827. The reversal of 91250761 is 16705219.

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 91250761 - 2¹ = 91250759 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91250741) 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, 6517905 + ... + 6517918.

It is an arithmetic number, because the mean of its divisors is an integer number (26071648).

Almost surely, 2^91250761 is an apocalyptic number.

It is an amenable number.

91250761 is a deficient number, since it is larger than the sum of its proper divisors (13035831).

91250761 is a wasteful number, since it uses less digits than its factorization.

91250761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13035830.

The product of its (nonzero) digits is 3780, while the sum is 31.

The square root of 91250761 is about 9552.5264197489. The cubic root of 91250761 is about 450.2069188318.

The spelling of 91250761 in words is "ninety-one million, two hundred fifty thousand, seven hundred sixty-one".