61188813 has 12 divisors (see below), whose sum is σ = 101010208. Its totient is φ = 34965000.

The previous prime is 61188793. The next prime is 61188817. The reversal of 61188813 is 31888116.

It is not a de Polignac number, because 61188813 - 2⁵ = 61188781 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61188817) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 485563 + ... + 485688.

Almost surely, 2^61188813 is an apocalyptic number.

61188813 is a gapful number since it is divisible by the number (63) formed by its first and last digit.

It is an amenable number.

61188813 is a deficient number, since it is larger than the sum of its proper divisors (39821395).

61188813 is a wasteful number, since it uses less digits than its factorization.

61188813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 971264 (or 971261 counting only the distinct ones).

The product of its digits is 9216, while the sum is 36.

The square root of 61188813 is about 7822.3278504547. The cubic root of 61188813 is about 394.0554539862.

It can be divided in two parts, 61188 and 813, that added together give a square (62001 = 249²).

The spelling of 61188813 in words is "sixty-one million, one hundred eighty-eight thousand, eight hundred thirteen".