629242921 has 2 divisors, whose sum is σ = 629242922. Its totient is φ = 629242920.

The previous prime is 629242919. The next prime is 629242973. The reversal of 629242921 is 129242926.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 393466896 + 235776025 = 19836^2 + 15355^2 .

It is a cyclic number.

It is not a de Polignac number, because 629242921 - 2¹ = 629242919 is a prime.

It is a super-2 number, since 2×629242921² = 791893307257224482, which contains 22 as substring.

Together with 629242919, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (629240921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 314621460 + 314621461.

It is an arithmetic number, because the mean of its divisors is an integer number (314621461).

Almost surely, 2^629242921 is an apocalyptic number.

It is an amenable number.

629242921 is a deficient number, since it is larger than the sum of its proper divisors (1).

629242921 is an equidigital number, since it uses as much as digits as its factorization.

629242921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31104, while the sum is 37.

The square root of 629242921 is about 25084.7148877559. The cubic root of 629242921 is about 856.9183564201.

The spelling of 629242921 in words is "six hundred twenty-nine million, two hundred forty-two thousand, nine hundred twenty-one".