631919011 has 2 divisors, whose sum is σ = 631919012. Its totient is φ = 631919010.

The previous prime is 631918949. The next prime is 631919017. The reversal of 631919011 is 110919136.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 631919011 - 2⁹ = 631918499 is a prime.

It is not a weakly prime, because it can be changed into another prime (631919017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315959505 + 315959506.

It is an arithmetic number, because the mean of its divisors is an integer number (315959506).

Almost surely, 2^631919011 is an apocalyptic number.

631919011 is a deficient number, since it is larger than the sum of its proper divisors (1).

631919011 is an equidigital number, since it uses as much as digits as its factorization.

631919011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1458, while the sum is 31.

The square root of 631919011 is about 25137.9993436232. Note that the first 3 decimals coincide. The cubic root of 631919011 is about 858.1314265740.

The spelling of 631919011 in words is "six hundred thirty-one million, nine hundred nineteen thousand, eleven".