61291136 has 64 divisors (see below), whose sum is σ = 129254400. Its totient is φ = 28892160.

The previous prime is 61291133. The next prime is 61291141. The reversal of 61291136 is 63119216.

It is a tau number, because it is divible by the number of its divisors (64).

It is a junction number, because it is equal to n+sod(n) for n = 61291099 and 61291108.

It is not an unprimeable number, because it can be changed into a prime (61291133) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 320801 + ... + 320991.

It is an arithmetic number, because the mean of its divisors is an integer number (2019600).

Almost surely, 2^61291136 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 61291136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (64627200).

61291136 is an abundant number, since it is smaller than the sum of its proper divisors (67963264).

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

61291136 is a wasteful number, since it uses less digits than its factorization.

61291136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 337 (or 325 counting only the distinct ones).

The product of its digits is 1944, while the sum is 29.

The square root of 61291136 is about 7828.8655627747. The cubic root of 61291136 is about 394.2749847552.

The spelling of 61291136 in words is "sixty-one million, two hundred ninety-one thousand, one hundred thirty-six".