632491861 has 2 divisors, whose sum is σ = 632491862. Its totient is φ = 632491860.

The previous prime is 632491843. The next prime is 632491879. The reversal of 632491861 is 168194236.

It is a balanced prime because it is at equal distance from previous prime (632491843) and next prime (632491879).

It can be written as a sum of positive squares in only one way, i.e., 619711236 + 12780625 = 24894^2 + 3575^2 .

It is a cyclic number.

It is not a de Polignac number, because 632491861 - 2⁷ = 632491733 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (632491841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 316245930 + 316245931.

It is an arithmetic number, because the mean of its divisors is an integer number (316245931).

Almost surely, 2^632491861 is an apocalyptic number.

It is an amenable number.

632491861 is a deficient number, since it is larger than the sum of its proper divisors (1).

632491861 is an equidigital number, since it uses as much as digits as its factorization.

632491861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 62208, while the sum is 40.

The square root of 632491861 is about 25149.3908673749. The cubic root of 632491861 is about 858.3906539489.

The spelling of 632491861 in words is "six hundred thirty-two million, four hundred ninety-one thousand, eight hundred sixty-one".