91544407 has 2 divisors, whose sum is σ = 91544408. Its totient is φ = 91544406.

The previous prime is 91544381. The next prime is 91544419. The reversal of 91544407 is 70444519.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91544407 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91544437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45772203 + 45772204.

It is an arithmetic number, because the mean of its divisors is an integer number (45772204).

Almost surely, 2^91544407 is an apocalyptic number.

91544407 is a deficient number, since it is larger than the sum of its proper divisors (1).

91544407 is an equidigital number, since it uses as much as digits as its factorization.

91544407 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20160, while the sum is 34.

The square root of 91544407 is about 9567.8841443655. The cubic root of 91544407 is about 450.6893254215.

The spelling of 91544407 in words is "ninety-one million, five hundred forty-four thousand, four hundred seven".