6131988 has 36 divisors (see below), whose sum is σ = 15768480. Its totient is φ = 2008656.

The previous prime is 6131981. The next prime is 6131989. The reversal of 6131988 is 8891316.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6131981) 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, 681 + ... + 3567.

Almost surely, 2^6131988 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 6131988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7884240).

6131988 is an abundant number, since it is smaller than the sum of its proper divisors (9636492).

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

6131988 is a wasteful number, since it uses less digits than its factorization.

6131988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2956 (or 2951 counting only the distinct ones).

The product of its digits is 10368, while the sum is 36.

The square root of 6131988 is about 2476.2851209019. The cubic root of 6131988 is about 183.0348406297.

It can be divided in two parts, 613 and 1988, that added together give a square (2601 = 51²).

The spelling of 6131988 in words is "six million, one hundred thirty-one thousand, nine hundred eighty-eight".