1631641231 has 8 divisors (see below), whose sum is σ = 1797254784. Its totient is φ = 1468908120.

The previous prime is 1631641223. The next prime is 1631641241. The reversal of 1631641231 is 1321461361.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1631641231 - 2³ = 1631641223 is a prime.

It is a super-2 number, since 2×1631641231² = 5324506213398390722, 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 1631641231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1631641201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 718921 + ... + 721186.

It is an arithmetic number, because the mean of its divisors is an integer number (224656848).

Almost surely, 2^1631641231 is an apocalyptic number.

1631641231 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1631641231 is a deficient number, since it is larger than the sum of its proper divisors (165613553).

1631641231 is a wasteful number, since it uses less digits than its factorization.

1631641231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1440221.

The product of its digits is 2592, while the sum is 28.

The square root of 1631641231 is about 40393.5790813342. The cubic root of 1631641231 is about 1177.2667829973.

The spelling of 1631641231 in words is "one billion, six hundred thirty-one million, six hundred forty-one thousand, two hundred thirty-one".