91948993 has 2 divisors, whose sum is σ = 91948994. Its totient is φ = 91948992.

The previous prime is 91948973. The next prime is 91949017. The reversal of 91948993 is 39984919.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 72386064 + 19562929 = 8508^2 + 4423^2 .

It is a cyclic number.

It is not a de Polignac number, because 91948993 - 2¹³ = 91940801 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 91948993.

It is not a weakly prime, because it can be changed into another prime (91948973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45974496 + 45974497.

It is an arithmetic number, because the mean of its divisors is an integer number (45974497).

Almost surely, 2^91948993 is an apocalyptic number.

It is an amenable number.

91948993 is a deficient number, since it is larger than the sum of its proper divisors (1).

91948993 is an equidigital number, since it uses as much as digits as its factorization.

91948993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 629856, while the sum is 52.

The square root of 91948993 is about 9589.0037543011. The cubic root of 91948993 is about 451.3522992005.

The spelling of 91948993 in words is "ninety-one million, nine hundred forty-eight thousand, nine hundred ninety-three".