61331100 has 36 divisors (see below), whose sum is σ = 177452184. Its totient is φ = 16354880.

The previous prime is 61331093. The next prime is 61331111. The reversal of 61331100 is 113316.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 61331100.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 101919 + ... + 102518.

Almost surely, 2^61331100 is an apocalyptic number.

61331100 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

61331100 is an abundant number, since it is smaller than the sum of its proper divisors (116121084).

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

61331100 is a wasteful number, since it uses less digits than its factorization.

61331100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204454 (or 204447 counting only the distinct ones).

The product of its (nonzero) digits is 54, while the sum is 15.

The square root of 61331100 is about 7831.4174962136. The cubic root of 61331100 is about 394.3606599066.

Adding to 61331100 its reverse (113316), we get a palindrome (61444416).

It can be divided in two parts, 613 and 31100, that added together give a palindrome (31713).

The spelling of 61331100 in words is "sixty-one million, three hundred thirty-one thousand, one hundred".