61331256 has 96 divisors (see below), whose sum is σ = 196909440. Its totient is φ = 17519328.

The previous prime is 61331233. The next prime is 61331261. The reversal of 61331256 is 65213316.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11355 + ... + 15861.

It is an arithmetic number, because the mean of its divisors is an integer number (2051140).

Almost surely, 2^61331256 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 61331256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98454720).

61331256 is an abundant number, since it is smaller than the sum of its proper divisors (135578184).

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

61331256 is a wasteful number, since it uses less digits than its factorization.

61331256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4535 (or 4519 counting only the distinct ones).

The product of its digits is 3240, while the sum is 27.

The square root of 61331256 is about 7831.4274560900. The cubic root of 61331256 is about 394.3609942677.

The spelling of 61331256 in words is "sixty-one million, three hundred thirty-one thousand, two hundred fifty-six".