91205461 has 4 divisors (see below), whose sum is σ = 91230624. Its totient is φ = 91180300.

The previous prime is 91205449. The next prime is 91205467. The reversal of 91205461 is 16450219.

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, and also an emirpimes, since its reverse is a distinct semiprime: 16450219 = 19 ⋅865801.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91205461 is a prime.

It is a super-2 number, since 2×91205461² = 16636872232445042, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91205467) 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, 5995 + ... + 14776.

It is an arithmetic number, because the mean of its divisors is an integer number (22807656).

Almost surely, 2^91205461 is an apocalyptic number.

It is an amenable number.

91205461 is a deficient number, since it is larger than the sum of its proper divisors (25163).

91205461 is a wasteful number, since it uses less digits than its factorization.

91205461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25162.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 91205461 is about 9550.1550249198. The cubic root of 91205461 is about 450.1324071275.

The spelling of 91205461 in words is "ninety-one million, two hundred five thousand, four hundred sixty-one".