91400537 has 2 divisors, whose sum is σ = 91400538. Its totient is φ = 91400536.

The previous prime is 91400497. The next prime is 91400539. The reversal of 91400537 is 73500419.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 53158681 + 38241856 = 7291^2 + 6184^2 .

It is an emirp because it is prime and its reverse (73500419) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91400537 - 2⁶ = 91400473 is a prime.

Together with 91400539, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (91400539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45700268 + 45700269.

It is an arithmetic number, because the mean of its divisors is an integer number (45700269).

Almost surely, 2^91400537 is an apocalyptic number.

It is an amenable number.

91400537 is a deficient number, since it is larger than the sum of its proper divisors (1).

91400537 is an equidigital number, since it uses as much as digits as its factorization.

91400537 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3780, while the sum is 29.

The square root of 91400537 is about 9560.3628069232. The cubic root of 91400537 is about 450.4531024683.

The spelling of 91400537 in words is "ninety-one million, four hundred thousand, five hundred thirty-seven".