71609091 has 16 divisors (see below), whose sum is σ = 99240960. Its totient is φ = 45874080.

The previous prime is 71609029. The next prime is 71609093. The reversal of 71609091 is 19090617.

It is not a de Polignac number, because 71609091 - 2⁷ = 71608963 is a prime.

It is not an unprimeable number, because it can be changed into a prime (71609093) 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, 17556 + ... + 21246.

It is an arithmetic number, because the mean of its divisors is an integer number (6202560).

Almost surely, 2^71609091 is an apocalyptic number.

71609091 is a deficient number, since it is larger than the sum of its proper divisors (27631869).

71609091 is a wasteful number, since it uses less digits than its factorization.

71609091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3946.

The product of its (nonzero) digits is 3402, while the sum is 33.

The square root of 71609091 is about 8462.2154900475. The cubic root of 71609091 is about 415.2625058109.

The spelling of 71609091 in words is "seventy-one million, six hundred nine thousand, ninety-one".