91161545 has 16 divisors (see below), whose sum is σ = 113218560. Its totient is φ = 70392000.

The previous prime is 91161541. The next prime is 91161547. The reversal of 91161545 is 54516119.

It is not a de Polignac number, because 91161545 - 2² = 91161541 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (91161541) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 108236 + ... + 109074.

It is an arithmetic number, because the mean of its divisors is an integer number (7076160).

Almost surely, 2^91161545 is an apocalyptic number.

It is an amenable number.

91161545 is a deficient number, since it is larger than the sum of its proper divisors (22057015).

91161545 is a wasteful number, since it uses less digits than its factorization.

91161545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1576.

The product of its digits is 5400, while the sum is 32.

The square root of 91161545 is about 9547.8555183874. The cubic root of 91161545 is about 450.0601483386.

The spelling of 91161545 in words is "ninety-one million, one hundred sixty-one thousand, five hundred forty-five".