91970159 has 2 divisors, whose sum is σ = 91970160. Its totient is φ = 91970158.

The previous prime is 91970147. The next prime is 91970171. The reversal of 91970159 is 95107919.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (91970147) and next prime (91970171).

It is a cyclic number.

It is not a de Polignac number, because 91970159 - 2⁸ = 91969903 is a prime.

It is a super-3 number, since 3×91970159³ (a number of 25 digits) contains 333 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91970759) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45985079 + 45985080.

It is an arithmetic number, because the mean of its divisors is an integer number (45985080).

Almost surely, 2^91970159 is an apocalyptic number.

91970159 is a deficient number, since it is larger than the sum of its proper divisors (1).

91970159 is an equidigital number, since it uses as much as digits as its factorization.

91970159 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25515, while the sum is 41.

The square root of 91970159 is about 9590.1073508069. The cubic root of 91970159 is about 451.3869292329.

It can be divided in two parts, 91970 and 159, that added together give a palindrome (92129).

The spelling of 91970159 in words is "ninety-one million, nine hundred seventy thousand, one hundred fifty-nine".