91020951 has 12 divisors (see below), whose sum is σ = 150256912. Its totient is φ = 52011936.

The previous prime is 91020949. The next prime is 91020961. The reversal of 91020951 is 15902019.

It is a happy number.

It is not a de Polignac number, because 91020951 - 2¹ = 91020949 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 (91020901) 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 11 ways as a sum of consecutive naturals, for example, 722326 + ... + 722451.

Almost surely, 2^91020951 is an apocalyptic number.

91020951 is a deficient number, since it is larger than the sum of its proper divisors (59235961).

91020951 is a wasteful number, since it uses less digits than its factorization.

91020951 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1444790 (or 1444787 counting only the distinct ones).

The product of its (nonzero) digits is 810, while the sum is 27.

The square root of 91020951 is about 9540.4900817516. The cubic root of 91020951 is about 449.8286606961.

The spelling of 91020951 in words is "ninety-one million, twenty thousand, nine hundred fifty-one".