91887796901 has 8 divisors (see below), whose sum is σ = 93640623480. Its totient is φ = 90135677632.

The previous prime is 91887796873. The next prime is 91887796907. The reversal of 91887796901 is 10969778819.

It is a Cunningham number, because it is equal to 303130²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 59597503876 + 32290293025 = 244126^2 + 179695^2 .

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 91887796901 - 2⁶ = 91887796837 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91887796907) 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, 89255 + ... + 437883.

It is an arithmetic number, because the mean of its divisors is an integer number (11705077935).

Almost surely, 2^91887796901 is an apocalyptic number.

It is an amenable number.

91887796901 is a deficient number, since it is larger than the sum of its proper divisors (1752826579).

91887796901 is a wasteful number, since it uses less digits than its factorization.

91887796901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 353655.

The product of its (nonzero) digits is 13716864, while the sum is 65.

The spelling of 91887796901 in words is "ninety-one billion, eight hundred eighty-seven million, seven hundred ninety-six thousand, nine hundred one".