91097396833989 has 32 divisors (see below), whose sum is σ = 149608070970624. Its totient is φ = 48014439782400.

The previous prime is 91097396833987. The next prime is 91097396834023. The reversal of 91097396833989 is 98933869379019.

It is not a de Polignac number, because 91097396833989 - 2¹ = 91097396833987 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91097396833987) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 127888524 + ... + 128598869.

It is an arithmetic number, because the mean of its divisors is an integer number (4675252217832).

Almost surely, 2^{91097396833989} is an apocalyptic number.

It is an amenable number.

91097396833989 is a deficient number, since it is larger than the sum of its proper divisors (58510674136635).

91097396833989 is a wasteful number, since it uses less digits than its factorization.

91097396833989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256488717.

The product of its (nonzero) digits is 4285540224, while the sum is 84.

The spelling of 91097396833989 in words is "ninety-one trillion, ninety-seven billion, three hundred ninety-six million, eight hundred thirty-three thousand, nine hundred eighty-nine".