91861651 has 8 divisors (see below), whose sum is σ = 105752160. Its totient is φ = 78163008.

The previous prime is 91861577. The next prime is 91861673. The reversal of 91861651 is 15616819.

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

It is a de Polignac number, because none of the positive numbers 2^k-91861651 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 91861651.

It is not an unprimeable number, because it can be changed into a prime (91861051) 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, 46936 + ... + 48853.

It is an arithmetic number, because the mean of its divisors is an integer number (13219020).

Almost surely, 2^91861651 is an apocalyptic number.

91861651 is a deficient number, since it is larger than the sum of its proper divisors (13890509).

91861651 is a wasteful number, since it uses less digits than its factorization.

91861651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95933.

The product of its digits is 12960, while the sum is 37.

The square root of 91861651 is about 9584.4483931001. The cubic root of 91861651 is about 451.2093413130.

The spelling of 91861651 in words is "ninety-one million, eight hundred sixty-one thousand, six hundred fifty-one".