631131469 has 2 divisors, whose sum is σ = 631131470. Its totient is φ = 631131468.

The previous prime is 631131451. The next prime is 631131497. The reversal of 631131469 is 964131136.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 630512100 + 619369 = 25110^2 + 787^2 .

It is a cyclic number.

It is not a de Polignac number, because 631131469 - 2¹³ = 631123277 is a prime.

It is a super-2 number, since 2×631131469² = 796653862324195922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (631131169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315565734 + 315565735.

It is an arithmetic number, because the mean of its divisors is an integer number (315565735).

Almost surely, 2^631131469 is an apocalyptic number.

It is an amenable number.

631131469 is a deficient number, since it is larger than the sum of its proper divisors (1).

631131469 is an equidigital number, since it uses as much as digits as its factorization.

631131469 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11664, while the sum is 34.

The square root of 631131469 is about 25122.3300869963. The cubic root of 631131469 is about 857.7747904270.

The spelling of 631131469 in words is "six hundred thirty-one million, one hundred thirty-one thousand, four hundred sixty-nine".