1631311641 has 6 divisors (see below), whose sum is σ = 2356339050. Its totient is φ = 1087541088.

The previous prime is 1631311637. The next prime is 1631311651. The reversal of 1631311641 is 1461131361.

1631311641 is a `hidden beast` number, since 1 + 6 + 3 + 1 + 3 + 11 + 641 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1291683600 + 339628041 = 35940^2 + 18429^2 .

It is not a de Polignac number, because 1631311641 - 2² = 1631311637 is a prime.

It is a super-2 number, since 2×1631311641² = 5322355340124225762, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1631311651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 90628416 + ... + 90628433.

It is an arithmetic number, because the mean of its divisors is an integer number (392723175).

Almost surely, 2^1631311641 is an apocalyptic number.

It is an amenable number.

1631311641 is a deficient number, since it is larger than the sum of its proper divisors (725027409).

1631311641 is a wasteful number, since it uses less digits than its factorization.

1631311641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181256855 (or 181256852 counting only the distinct ones).

The product of its digits is 1296, while the sum is 27.

The square root of 1631311641 is about 40389.4991427227. The cubic root of 1631311641 is about 1177.1875087302.

The spelling of 1631311641 in words is "one billion, six hundred thirty-one million, three hundred eleven thousand, six hundred forty-one".