91004957 has 2 divisors, whose sum is σ = 91004958. Its totient is φ = 91004956.

The previous prime is 91004923. The next prime is 91004983. The reversal of 91004957 is 75940019.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 81830116 + 9174841 = 9046^2 + 3029^2 .

It is an emirp because it is prime and its reverse (75940019) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91004957 - 2¹⁰ = 91003933 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91004057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45502478 + 45502479.

It is an arithmetic number, because the mean of its divisors is an integer number (45502479).

Almost surely, 2^91004957 is an apocalyptic number.

It is an amenable number.

91004957 is a deficient number, since it is larger than the sum of its proper divisors (1).

91004957 is an equidigital number, since it uses as much as digits as its factorization.

91004957 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11340, while the sum is 35.

The square root of 91004957 is about 9539.6518280281. The cubic root of 91004957 is about 449.8023115205.

The spelling of 91004957 in words is "ninety-one million, four thousand, nine hundred fifty-seven".