628117031 has 2 divisors, whose sum is σ = 628117032. Its totient is φ = 628117030.

The previous prime is 628116997. The next prime is 628117043. The reversal of 628117031 is 130711826.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-628117031 is a prime.

It is a super-2 number, since 2×628117031² = 789062009264509922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 628116985 and 628117003.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (628117531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 314058515 + 314058516.

It is an arithmetic number, because the mean of its divisors is an integer number (314058516).

Almost surely, 2^628117031 is an apocalyptic number.

628117031 is a deficient number, since it is larger than the sum of its proper divisors (1).

628117031 is an equidigital number, since it uses as much as digits as its factorization.

628117031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 628117031 is about 25062.2630861620. The cubic root of 628117031 is about 856.4069631368.

Adding to 628117031 its reverse (130711826), we get a palindrome (758828857).

The spelling of 628117031 in words is "six hundred twenty-eight million, one hundred seventeen thousand, thirty-one".