91370549 has 2 divisors, whose sum is σ = 91370550. Its totient is φ = 91370548.

The previous prime is 91370537. The next prime is 91370551. The reversal of 91370549 is 94507319.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 83631025 + 7739524 = 9145^2 + 2782^2 .

It is a cyclic number.

It is not a de Polignac number, because 91370549 - 2¹² = 91366453 is a prime.

It is a super-2 number, since 2×91370549² = 16697154449122802, which contains 22 as substring.

Together with 91370551, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91370519) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45685274 + 45685275.

It is an arithmetic number, because the mean of its divisors is an integer number (45685275).

Almost surely, 2^91370549 is an apocalyptic number.

It is an amenable number.

91370549 is a deficient number, since it is larger than the sum of its proper divisors (1).

91370549 is an equidigital number, since it uses as much as digits as its factorization.

91370549 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34020, while the sum is 38.

The square root of 91370549 is about 9558.7943277382. The cubic root of 91370549 is about 450.4038333733.

It can be divided in two parts, 91370 and 549, that added together give a palindrome (91919).

The spelling of 91370549 in words is "ninety-one million, three hundred seventy thousand, five hundred forty-nine".