631617461 has 2 divisors, whose sum is σ = 631617462. Its totient is φ = 631617460.

The previous prime is 631617449. The next prime is 631617517. The reversal of 631617461 is 164716136.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 598047025 + 33570436 = 24455^2 + 5794^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-631617461 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (631617401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315808730 + 315808731.

It is an arithmetic number, because the mean of its divisors is an integer number (315808731).

Almost surely, 2^631617461 is an apocalyptic number.

It is an amenable number.

631617461 is a deficient number, since it is larger than the sum of its proper divisors (1).

631617461 is an equidigital number, since it uses as much as digits as its factorization.

631617461 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18144, while the sum is 35.

The square root of 631617461 is about 25132.0007361133. Note that the first 3 decimals coincide. The cubic root of 631617461 is about 857.9949055433.

The spelling of 631617461 in words is "six hundred thirty-one million, six hundred seventeen thousand, four hundred sixty-one".