629404781 has 2 divisors, whose sum is σ = 629404782. Its totient is φ = 629404780.

The previous prime is 629404739. The next prime is 629404799. The reversal of 629404781 is 187404926.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 602260681 + 27144100 = 24541^2 + 5210^2 .

It is a cyclic number.

It is not a de Polignac number, because 629404781 - 2¹⁸ = 629142637 is a prime.

It is a super-2 number, since 2×629404781² = 792300756691315922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (629404681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 314702390 + 314702391.

It is an arithmetic number, because the mean of its divisors is an integer number (314702391).

Almost surely, 2^629404781 is an apocalyptic number.

It is an amenable number.

629404781 is a deficient number, since it is larger than the sum of its proper divisors (1).

629404781 is an equidigital number, since it uses as much as digits as its factorization.

629404781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96768, while the sum is 41.

The square root of 629404781 is about 25087.9409477940. The cubic root of 629404781 is about 856.9918250862.

The spelling of 629404781 in words is "six hundred twenty-nine million, four hundred four thousand, seven hundred eighty-one".