629121401 has 2 divisors, whose sum is σ = 629121402. Its totient is φ = 629121400.

The previous prime is 629121379. The next prime is 629121403. The reversal of 629121401 is 104121926.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 411116176 + 218005225 = 20276^2 + 14765^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-629121401 is a prime.

Together with 629121403, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (629121403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 314560700 + 314560701.

It is an arithmetic number, because the mean of its divisors is an integer number (314560701).

Almost surely, 2^629121401 is an apocalyptic number.

It is an amenable number.

629121401 is a deficient number, since it is larger than the sum of its proper divisors (1).

629121401 is an equidigital number, since it uses as much as digits as its factorization.

629121401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 629121401 is about 25082.2925786300. The cubic root of 629121401 is about 856.8631899021.

The spelling of 629121401 in words is "six hundred twenty-nine million, one hundred twenty-one thousand, four hundred one".