91146641 has 2 divisors, whose sum is σ = 91146642. Its totient is φ = 91146640.

The previous prime is 91146637. The next prime is 91146661. The reversal of 91146641 is 14664119.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68145025 + 23001616 = 8255^2 + 4796^2 .

It is a cyclic number.

It is not a de Polignac number, because 91146641 - 2² = 91146637 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 91146598 and 91146607.

It is not a weakly prime, because it can be changed into another prime (91146611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45573320 + 45573321.

It is an arithmetic number, because the mean of its divisors is an integer number (45573321).

Almost surely, 2^91146641 is an apocalyptic number.

It is an amenable number.

91146641 is a deficient number, since it is larger than the sum of its proper divisors (1).

91146641 is an equidigital number, since it uses as much as digits as its factorization.

91146641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5184, while the sum is 32.

The square root of 91146641 is about 9547.0749970868. The cubic root of 91146641 is about 450.0356202256.

It can be divided in two parts, 91 and 146641, that multiplied together give a palindrome (13344331).

The spelling of 91146641 in words is "ninety-one million, one hundred forty-six thousand, six hundred forty-one".