61591236 has 144 divisors (see below), whose sum is σ = 181944000. Its totient is φ = 16111872.

The previous prime is 61591207. The next prime is 61591241. The reversal of 61591236 is 63219516.

It is a happy number.

61591236 is digitally balanced in base 9, because in such base it contains all the possibile digits an equal number of times.

61591236 is strictly pandigital in base 9.

It is a junction number, because it is equal to n+sod(n) for n = 61591197 and 61591206.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 413290 + ... + 413438.

It is an arithmetic number, because the mean of its divisors is an integer number (1263500).

Almost surely, 2^61591236 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61591236, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (90972000).

61591236 is an abundant number, since it is smaller than the sum of its proper divisors (120352764).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61591236 is a wasteful number, since it uses less digits than its factorization.

61591236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226 (or 217 counting only the distinct ones).

The product of its digits is 9720, while the sum is 33.

The square root of 61591236 is about 7848.0084097814. The cubic root of 61591236 is about 394.9174340058.

The spelling of 61591236 in words is "sixty-one million, five hundred ninety-one thousand, two hundred thirty-six".