91969137 has 12 divisors (see below), whose sum is σ = 143063284. Its totient is φ = 56596320.

The previous prime is 91969127. The next prime is 91969159. The reversal of 91969137 is 73196919.

It can be written as a sum of positive squares in 2 ways, for example, as 10265616 + 81703521 = 3204^2 + 9039^2 .

It is not a de Polignac number, because 91969137 - 2¹⁶ = 91903601 is a prime.

It is a super-3 number, since 3×91969137³ (a number of 25 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 91969092 and 91969101.

It is not an unprimeable number, because it can be changed into a prime (91969127) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 392914 + ... + 393147.

Almost surely, 2^91969137 is an apocalyptic number.

It is an amenable number.

91969137 is a deficient number, since it is larger than the sum of its proper divisors (51094147).

91969137 is a wasteful number, since it uses less digits than its factorization.

91969137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 786080 (or 786077 counting only the distinct ones).

The product of its digits is 91854, while the sum is 45.

The square root of 91969137 is about 9590.0540665838. The cubic root of 91969137 is about 451.3852572444.

The spelling of 91969137 in words is "ninety-one million, nine hundred sixty-nine thousand, one hundred thirty-seven".