91948807 has 2 divisors, whose sum is σ = 91948808. Its totient is φ = 91948806.

The previous prime is 91948781. The next prime is 91948819. The reversal of 91948807 is 70884919.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91948807 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91948877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45974403 + 45974404.

It is an arithmetic number, because the mean of its divisors is an integer number (45974404).

Almost surely, 2^91948807 is an apocalyptic number.

91948807 is a deficient number, since it is larger than the sum of its proper divisors (1).

91948807 is an equidigital number, since it uses as much as digits as its factorization.

91948807 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 145152, while the sum is 46.

The square root of 91948807 is about 9588.9940556870. The cubic root of 91948807 is about 451.3519948594.

It can be divided in two parts, 9 and 1948807, that added together give a square (1948816 = 1396²).

The spelling of 91948807 in words is "ninety-one million, nine hundred forty-eight thousand, eight hundred seven".