91001120731 has 8 divisors (see below), whose sum is σ = 91501375680. Its totient is φ = 90501253248.

The previous prime is 91001120699. The next prime is 91001120737. The reversal of 91001120731 is 13702110019.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 91001120731 - 2⁵ = 91001120699 is a prime.

It is a super-2 number, since 2×91001120731² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 91001120696 and 91001120705.

It is not an unprimeable number, because it can be changed into a prime (91001120737) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 380590 + ... + 571708.

It is an arithmetic number, because the mean of its divisors is an integer number (11437671960).

Almost surely, 2^91001120731 is an apocalyptic number.

91001120731 is a deficient number, since it is larger than the sum of its proper divisors (500254949).

91001120731 is a wasteful number, since it uses less digits than its factorization.

91001120731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193733.

The product of its (nonzero) digits is 378, while the sum is 25.

The spelling of 91001120731 in words is "ninety-one billion, one million, one hundred twenty thousand, seven hundred thirty-one".