91561853 has 8 divisors (see below), whose sum is σ = 93327960. Its totient is φ = 89812800.

The previous prime is 91561843. The next prime is 91561867. The reversal of 91561853 is 35816519.

It can be written as a sum of positive squares in 4 ways, for example, as 73736569 + 17825284 = 8587^2 + 4222^2 .

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 91561853 - 2⁴ = 91561837 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 (91561823) 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, 6851 + ... + 15167.

It is an arithmetic number, because the mean of its divisors is an integer number (11665995).

Almost surely, 2^91561853 is an apocalyptic number.

It is an amenable number.

91561853 is a deficient number, since it is larger than the sum of its proper divisors (1766107).

91561853 is a wasteful number, since it uses less digits than its factorization.

91561853 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8527.

The product of its digits is 32400, while the sum is 38.

The square root of 91561853 is about 9568.7957967552. The cubic root of 91561853 is about 450.7179535187.

The spelling of 91561853 in words is "ninety-one million, five hundred sixty-one thousand, eight hundred fifty-three".