91137261 has 4 divisors (see below), whose sum is σ = 121516352. Its totient is φ = 60758172.

The previous prime is 91137259. The next prime is 91137287. The reversal of 91137261 is 16273119.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 91137261 - 2¹ = 91137259 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 (91137461) 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, 15189541 + ... + 15189546.

It is an arithmetic number, because the mean of its divisors is an integer number (30379088).

Almost surely, 2^91137261 is an apocalyptic number.

It is an amenable number.

91137261 is a deficient number, since it is larger than the sum of its proper divisors (30379091).

91137261 is a wasteful number, since it uses less digits than its factorization.

91137261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30379090.

The product of its digits is 2268, while the sum is 30.

The square root of 91137261 is about 9546.5837345094. The cubic root of 91137261 is about 450.0201818109.

The spelling of 91137261 in words is "ninety-one million, one hundred thirty-seven thousand, two hundred sixty-one".