91713481 has 2 divisors, whose sum is σ = 91713482. Its totient is φ = 91713480.

The previous prime is 91713463. The next prime is 91713511. The reversal of 91713481 is 18431719.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 83539600 + 8173881 = 9140^2 + 2859^2 .

It is a cyclic number.

It is not a de Polignac number, because 91713481 - 2¹⁵ = 91680713 is a prime.

It is a super-2 number, since 2×91713481² = 16822725194274722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (91713421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45856740 + 45856741.

It is an arithmetic number, because the mean of its divisors is an integer number (45856741).

Almost surely, 2^91713481 is an apocalyptic number.

It is an amenable number.

91713481 is a deficient number, since it is larger than the sum of its proper divisors (1).

91713481 is an equidigital number, since it uses as much as digits as its factorization.

91713481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6048, while the sum is 34.

The square root of 91713481 is about 9576.7155643258. The cubic root of 91713481 is about 450.9666151954.

It can be divided in two parts, 9 and 1713481, that multiplied together give a square (15421329 = 3927²).

The spelling of 91713481 in words is "ninety-one million, seven hundred thirteen thousand, four hundred eighty-one".