631623437 has 2 divisors, whose sum is σ = 631623438. Its totient is φ = 631623436.

The previous prime is 631623383. The next prime is 631623511. The reversal of 631623437 is 734326136.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 588838756 + 42784681 = 24266^2 + 6541^2 .

It is a cyclic number.

It is not a de Polignac number, because 631623437 - 2⁶ = 631623373 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 631623397 and 631623406.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (631623037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315811718 + 315811719.

It is an arithmetic number, because the mean of its divisors is an integer number (315811719).

Almost surely, 2^631623437 is an apocalyptic number.

It is an amenable number.

631623437 is a deficient number, since it is larger than the sum of its proper divisors (1).

631623437 is an equidigital number, since it uses as much as digits as its factorization.

631623437 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54432, while the sum is 35.

The square root of 631623437 is about 25132.1196280775. The cubic root of 631623437 is about 857.9976114857.

The spelling of 631623437 in words is "six hundred thirty-one million, six hundred twenty-three thousand, four hundred thirty-seven".