91739134787 has 2 divisors, whose sum is σ = 91739134788. Its totient is φ = 91739134786.

The previous prime is 91739134717. The next prime is 91739134801. The reversal of 91739134787 is 78743193719.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 91739134787 - 2²² = 91734940483 is a prime.

It is not a weakly prime, because it can be changed into another prime (91739134717) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45869567393 + 45869567394.

It is an arithmetic number, because the mean of its divisors is an integer number (45869567394).

Almost surely, 2^91739134787 is an apocalyptic number.

91739134787 is a deficient number, since it is larger than the sum of its proper divisors (1).

91739134787 is an equidigital number, since it uses as much as digits as its factorization.

91739134787 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8001504, while the sum is 59.

The spelling of 91739134787 in words is "ninety-one billion, seven hundred thirty-nine million, one hundred thirty-four thousand, seven hundred eighty-seven".