91061863 has 4 divisors (see below), whose sum is σ = 92085120. Its totient is φ = 90038608.

The previous prime is 91061857. The next prime is 91061869. The reversal of 91061863 is 36816019.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (91061857) and next prime (91061869).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91061863 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 (91061869) 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, 511495 + ... + 511672.

It is an arithmetic number, because the mean of its divisors is an integer number (23021280).

Almost surely, 2^91061863 is an apocalyptic number.

91061863 is a deficient number, since it is larger than the sum of its proper divisors (1023257).

91061863 is a wasteful number, since it uses less digits than its factorization.

91061863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1023256.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 91061863 is about 9542.6339655255. The cubic root of 91061863 is about 449.8960467698.

The spelling of 91061863 in words is "ninety-one million, sixty-one thousand, eight hundred sixty-three".