61040091 has 32 divisors (see below), whose sum is σ = 99348480. Its totient is φ = 32576544.

The previous prime is 61040071. The next prime is 61040101. The reversal of 61040091 is 19004016.

It is not a de Polignac number, because 61040091 - 2⁵ = 61040059 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (61040011) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19300 + ... + 22238.

It is an arithmetic number, because the mean of its divisors is an integer number (3104640).

Almost surely, 2^61040091 is an apocalyptic number.

61040091 is a deficient number, since it is larger than the sum of its proper divisors (38308389).

61040091 is a wasteful number, since it uses less digits than its factorization.

61040091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3015.

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 61040091 is about 7812.8158176166. The cubic root of 61040091 is about 393.7359388277.

The spelling of 61040091 in words is "sixty-one million, forty thousand, ninety-one".