91563151 has 4 divisors (see below), whose sum is σ = 91630000. Its totient is φ = 91496304.

The previous prime is 91563107. The next prime is 91563167. The reversal of 91563151 is 15136519.

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

It is a cyclic number.

It is not a de Polignac number, because 91563151 - 2¹³ = 91554959 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 (91663151) 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, 31326 + ... + 34123.

It is an arithmetic number, because the mean of its divisors is an integer number (22907500).

Almost surely, 2^91563151 is an apocalyptic number.

91563151 is a deficient number, since it is larger than the sum of its proper divisors (66849).

91563151 is a wasteful number, since it uses less digits than its factorization.

91563151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66848.

The product of its digits is 4050, while the sum is 31.

The square root of 91563151 is about 9568.8636211412. The cubic root of 91563151 is about 450.7200833327.

The spelling of 91563151 in words is "ninety-one million, five hundred sixty-three thousand, one hundred fifty-one".