91693513 has 2 divisors, whose sum is σ = 91693514. Its totient is φ = 91693512.

The previous prime is 91693499. The next prime is 91693519. The reversal of 91693513 is 31539619.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 52606009 + 39087504 = 7253^2 + 6252^2 .

It is a cyclic number.

It is not a de Polignac number, because 91693513 - 2¹⁷ = 91562441 is a prime.

It is equal to p_5309569 and since 91693513 and 5309569 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (91693519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45846756 + 45846757.

It is an arithmetic number, because the mean of its divisors is an integer number (45846757).

Almost surely, 2^91693513 is an apocalyptic number.

It is an amenable number.

91693513 is a deficient number, since it is larger than the sum of its proper divisors (1).

91693513 is an equidigital number, since it uses as much as digits as its factorization.

91693513 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21870, while the sum is 37.

The square root of 91693513 is about 9575.6729789608. The cubic root of 91693513 is about 450.9338844384.

The spelling of 91693513 in words is "ninety-one million, six hundred ninety-three thousand, five hundred thirteen".