6181631 has 4 divisors (see below), whose sum is σ = 6507000. Its totient is φ = 5856264.

The previous prime is 6181619. The next prime is 6181633. The reversal of 6181631 is 1361816.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6181631 is a prime.

It is a super-2 number, since 2×6181631² = 76425123640322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6181631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6181633) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 162656 + ... + 162693.

It is an arithmetic number, because the mean of its divisors is an integer number (1626750).

Almost surely, 2^6181631 is an apocalyptic number.

6181631 is a deficient number, since it is larger than the sum of its proper divisors (325369).

6181631 is a wasteful number, since it uses less digits than its factorization.

6181631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 325368.

The product of its digits is 864, while the sum is 26.

The square root of 6181631 is about 2486.2885994993. The cubic root of 6181631 is about 183.5274480246.

The spelling of 6181631 in words is "six million, one hundred eighty-one thousand, six hundred thirty-one".