31644432131 has 8 divisors (see below), whose sum is σ = 34089376944. Its totient is φ = 29201024160.

The previous prime is 31644432101. The next prime is 31644432137. The reversal of 31644432131 is 13123444613.

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 31644432131 - 2⁶ = 31644432067 is a prime.

It is a super-2 number, since 2×31644432131² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31644432137) 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, 341261 + ... + 423966.

It is an arithmetic number, because the mean of its divisors is an integer number (4261172118).

Almost surely, 2^31644432131 is an apocalyptic number.

31644432131 is a deficient number, since it is larger than the sum of its proper divisors (2444944813).

31644432131 is a wasteful number, since it uses less digits than its factorization.

31644432131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 768421.

The product of its digits is 20736, while the sum is 32.

Adding to 31644432131 its reverse (13123444613), we get a palindrome (44767876744).

The spelling of 31644432131 in words is "thirty-one billion, six hundred forty-four million, four hundred thirty-two thousand, one hundred thirty-one".