91551077 has 4 divisors (see below), whose sum is σ = 91700076. Its totient is φ = 91402080.

The previous prime is 91551071. The next prime is 91551079. The reversal of 91551077 is 77015519.

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

It can be written as a sum of positive squares in 2 ways, for example, as 4800481 + 86750596 = 2191^2 + 9314^2 .

It is a cyclic number.

It is not a de Polignac number, because 91551077 - 2¹⁸ = 91288933 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 (91551071) 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, 73574 + ... + 74807.

It is an arithmetic number, because the mean of its divisors is an integer number (22925019).

Almost surely, 2^91551077 is an apocalyptic number.

It is an amenable number.

91551077 is a deficient number, since it is larger than the sum of its proper divisors (148999).

91551077 is a wasteful number, since it uses less digits than its factorization.

91551077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148998.

The product of its (nonzero) digits is 11025, while the sum is 35.

The square root of 91551077 is about 9568.2326999295. The cubic root of 91551077 is about 450.7002710194.

The spelling of 91551077 in words is "ninety-one million, five hundred fifty-one thousand, seventy-seven".