631111477 has 2 divisors, whose sum is σ = 631111478. Its totient is φ = 631111476.

The previous prime is 631111463. The next prime is 631111493. The reversal of 631111477 is 774111136.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 319730161 + 311381316 = 17881^2 + 17646^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-631111477 is a prime.

It is a super-2 number, since 2×631111477² = 796603392802243058, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (631111457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315555738 + 315555739.

It is an arithmetic number, because the mean of its divisors is an integer number (315555739).

Almost surely, 2^631111477 is an apocalyptic number.

It is an amenable number.

631111477 is a deficient number, since it is larger than the sum of its proper divisors (1).

631111477 is an equidigital number, since it uses as much as digits as its factorization.

631111477 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3528, while the sum is 31.

The square root of 631111477 is about 25121.9321908169. The cubic root of 631111477 is about 857.7657332467.

The spelling of 631111477 in words is "six hundred thirty-one million, one hundred eleven thousand, four hundred seventy-seven".