91163651 has 4 divisors (see below), whose sum is σ = 95127312. Its totient is φ = 87199992.

The previous prime is 91163629. The next prime is 91163663. The reversal of 91163651 is 15636119.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 91163651 - 2¹⁸ = 90901507 is a prime.

It is a super-3 number, since 3×91163651³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91163621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1981796 + ... + 1981841.

It is an arithmetic number, because the mean of its divisors is an integer number (23781828).

Almost surely, 2^91163651 is an apocalyptic number.

91163651 is a deficient number, since it is larger than the sum of its proper divisors (3963661).

91163651 is a wasteful number, since it uses less digits than its factorization.

91163651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3963660.

The product of its digits is 4860, while the sum is 32.

The square root of 91163651 is about 9547.9658042957. The cubic root of 91163651 is about 450.0636140521.

The spelling of 91163651 in words is "ninety-one million, one hundred sixty-three thousand, six hundred fifty-one".