91970623 has 2 divisors, whose sum is σ = 91970624. Its totient is φ = 91970622.

The previous prime is 91970617. The next prime is 91970633. The reversal of 91970623 is 32607919.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 91970623 - 2⁵ = 91970591 is a prime.

It is a super-3 number, since 3×91970623³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91970633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45985311 + 45985312.

It is an arithmetic number, because the mean of its divisors is an integer number (45985312).

Almost surely, 2^91970623 is an apocalyptic number.

91970623 is a deficient number, since it is larger than the sum of its proper divisors (1).

91970623 is an equidigital number, since it uses as much as digits as its factorization.

91970623 is an evil number, because the sum of its binary digits is even.

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

The square root of 91970623 is about 9590.1315423721. The cubic root of 91970623 is about 451.3876883313.

The spelling of 91970623 in words is "ninety-one million, nine hundred seventy thousand, six hundred twenty-three".