91575716461 has 4 divisors (see below), whose sum is σ = 91591875900. Its totient is φ = 91559557024.

The previous prime is 91575716443. The next prime is 91575716489. The reversal of 91575716461 is 16461757519.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16461757519 = 29 ⋅567646811.

It can be written as a sum of positive squares in 2 ways, for example, as 8980405225 + 82595311236 = 94765^2 + 287394^2 .

It is a cyclic number.

It is not a de Polignac number, because 91575716461 - 2⁷ = 91575716333 is a prime.

It is a super-2 number, since 2×91575716461² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 91575716399 and 91575716408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91575716261) 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, 8071216 + ... + 8082553.

It is an arithmetic number, because the mean of its divisors is an integer number (22897968975).

Almost surely, 2^91575716461 is an apocalyptic number.

It is an amenable number.

91575716461 is a deficient number, since it is larger than the sum of its proper divisors (16159439).

91575716461 is a wasteful number, since it uses less digits than its factorization.

91575716461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16159438.

The product of its digits is 1587600, while the sum is 52.

The spelling of 91575716461 in words is "ninety-one billion, five hundred seventy-five million, seven hundred sixteen thousand, four hundred sixty-one".