630919 has 2 divisors, whose sum is σ = 630920. Its totient is φ = 630918.

The previous prime is 630911. The next prime is 630941. The reversal of 630919 is 919036.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 630919 - 2³ = 630911 is a prime.

It is a super-2 number, since 2×630919² = 796117569122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (630911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315459 + 315460.

It is an arithmetic number, because the mean of its divisors is an integer number (315460).

2⁶³⁰⁹¹⁹ is an apocalyptic number.

630919 is a deficient number, since it is larger than the sum of its proper divisors (1).

630919 is an equidigital number, since it uses as much as digits as its factorization.

630919 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 28.

The square root of 630919 is about 794.3040979373. The cubic root of 630919 is about 85.7678523634.

It can be divided in two parts, 6309 and 19, that added together give a triangular number (6328 = T₁₁₂).

The spelling of 630919 in words is "six hundred thirty thousand, nine hundred nineteen".