631611899 has 2 divisors, whose sum is σ = 631611900. Its totient is φ = 631611898.

The previous prime is 631611859. The next prime is 631611943. The reversal of 631611899 is 998116136.

It is a happy number.

It is an a-pointer prime, because the next prime (631611943) can be obtained adding 631611899 to its sum of digits (44).

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-631611899 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (631611839) 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 as a sum of consecutive naturals, namely, 315805949 + 315805950.

It is an arithmetic number, because the mean of its divisors is an integer number (315805950).

Almost surely, 2^631611899 is an apocalyptic number.

631611899 is a deficient number, since it is larger than the sum of its proper divisors (1).

631611899 is an equidigital number, since it uses as much as digits as its factorization.

631611899 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69984, while the sum is 44.

The square root of 631611899 is about 25131.8900801352. The cubic root of 631611899 is about 857.9923870455.

The spelling of 631611899 in words is "six hundred thirty-one million, six hundred eleven thousand, eight hundred ninety-nine".