91406890292 has 6 divisors (see below), whose sum is σ = 159962058018. Its totient is φ = 45703445144.

The previous prime is 91406890277. The next prime is 91406890303. The reversal of 91406890292 is 29209860419.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 59538928036 + 31867962256 = 244006^2 + 178516^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 91406890292.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11425861283 + ... + 11425861290.

It is an arithmetic number, because the mean of its divisors is an integer number (26660343003).

Almost surely, 2^91406890292 is an apocalyptic number.

It is an amenable number.

91406890292 is a deficient number, since it is larger than the sum of its proper divisors (68555167726).

91406890292 is a wasteful number, since it uses less digits than its factorization.

91406890292 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22851722577 (or 22851722575 counting only the distinct ones).

The product of its (nonzero) digits is 559872, while the sum is 50.

The spelling of 91406890292 in words is "ninety-one billion, four hundred six million, eight hundred ninety thousand, two hundred ninety-two".