629147861 has 2 divisors, whose sum is σ = 629147862. Its totient is φ = 629147860.

The previous prime is 629147843. The next prime is 629147867. The reversal of 629147861 is 168741926.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 449185636 + 179962225 = 21194^2 + 13415^2 .

It is a cyclic number.

It is not a de Polignac number, because 629147861 - 2¹⁸ = 628885717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (629147867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 314573930 + 314573931.

It is an arithmetic number, because the mean of its divisors is an integer number (314573931).

Almost surely, 2^629147861 is an apocalyptic number.

It is an amenable number.

629147861 is a deficient number, since it is larger than the sum of its proper divisors (1).

629147861 is an equidigital number, since it uses as much as digits as its factorization.

629147861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 145152, while the sum is 44.

The square root of 629147861 is about 25082.8200368300. The cubic root of 629147861 is about 856.8752025714.

The spelling of 629147861 in words is "six hundred twenty-nine million, one hundred forty-seven thousand, eight hundred sixty-one".