91057501 has 2 divisors, whose sum is σ = 91057502. Its totient is φ = 91057500.

The previous prime is 91057493. The next prime is 91057507. The reversal of 91057501 is 10575019.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 68873401 + 22184100 = 8299^2 + 4710^2 .

It is a cyclic number.

It is not a de Polignac number, because 91057501 - 2³ = 91057493 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 91057501.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91057507) 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 as a sum of consecutive naturals, namely, 45528750 + 45528751.

It is an arithmetic number, because the mean of its divisors is an integer number (45528751).

Almost surely, 2^91057501 is an apocalyptic number.

It is an amenable number.

91057501 is a deficient number, since it is larger than the sum of its proper divisors (1).

91057501 is an equidigital number, since it uses as much as digits as its factorization.

91057501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1575, while the sum is 28.

The square root of 91057501 is about 9542.4054095390. The cubic root of 91057501 is about 449.8888630897. Note that the first 4 decimals are identical.

The spelling of 91057501 in words is "ninety-one million, fifty-seven thousand, five hundred one".