91662457 has 2 divisors, whose sum is σ = 91662458. Its totient is φ = 91662456.

The previous prime is 91662437. The next prime is 91662497. The reversal of 91662457 is 75426619.

It is an a-pointer prime, because the next prime (91662497) can be obtained adding 91662457 to its sum of digits (40).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68823616 + 22838841 = 8296^2 + 4779^2 .

It is an emirp because it is prime and its reverse (75426619) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91662457 - 2¹¹ = 91660409 is a prime.

It is not a weakly prime, because it can be changed into another prime (91662427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45831228 + 45831229.

It is an arithmetic number, because the mean of its divisors is an integer number (45831229).

Almost surely, 2^91662457 is an apocalyptic number.

It is an amenable number.

91662457 is a deficient number, since it is larger than the sum of its proper divisors (1).

91662457 is an equidigital number, since it uses as much as digits as its factorization.

91662457 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 90720, while the sum is 40.

The square root of 91662457 is about 9574.0512323676. The cubic root of 91662457 is about 450.8829692260.

The spelling of 91662457 in words is "ninety-one million, six hundred sixty-two thousand, four hundred fifty-seven".