630287261 has 2 divisors, whose sum is σ = 630287262. Its totient is φ = 630287260.

The previous prime is 630287227. The next prime is 630287263. The reversal of 630287261 is 162782036.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 445463236 + 184824025 = 21106^2 + 13595^2 .

It is a cyclic number.

It is not a de Polignac number, because 630287261 - 2¹⁴ = 630270877 is a prime.

Together with 630287263, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (630287263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315143630 + 315143631.

It is an arithmetic number, because the mean of its divisors is an integer number (315143631).

Almost surely, 2^630287261 is an apocalyptic number.

It is an amenable number.

630287261 is a deficient number, since it is larger than the sum of its proper divisors (1).

630287261 is an equidigital number, since it uses as much as digits as its factorization.

630287261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 630287261 is about 25105.5225199556. The cubic root of 630287261 is about 857.3921636218.

The spelling of 630287261 in words is "six hundred thirty million, two hundred eighty-seven thousand, two hundred sixty-one".