91356121 has 8 divisors (see below), whose sum is σ = 92610144. Its totient is φ = 90110880.

The previous prime is 91356103. The next prime is 91356127. The reversal of 91356121 is 12165319.

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 91356121 - 2⁷ = 91355993 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 91356121.

It is not an unprimeable number, because it can be changed into a prime (91356127) 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, 20286 + ... + 24376.

It is an arithmetic number, because the mean of its divisors is an integer number (11576268).

Almost surely, 2^91356121 is an apocalyptic number.

It is an amenable number.

91356121 is a deficient number, since it is larger than the sum of its proper divisors (1254023).

91356121 is a wasteful number, since it uses less digits than its factorization.

91356121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4391.

The product of its digits is 1620, while the sum is 28.

The square root of 91356121 is about 9558.0396002528. The cubic root of 91356121 is about 450.3801249003.

The spelling of 91356121 in words is "ninety-one million, three hundred fifty-six thousand, one hundred twenty-one".