629698981 has 4 divisors (see below), whose sum is σ = 630160992. Its totient is φ = 629236972.

The previous prime is 629698963. The next prime is 629698999. The reversal of 629698981 is 189896926.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (629698963) and next prime (629698999).

It is a cyclic number.

It is not a de Polignac number, because 629698981 - 2⁹ = 629698469 is a prime.

It is a super-2 number, since 2×629698981² = 793041613344876722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (629698961) 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 in 3 ways as a sum of consecutive naturals, for example, 228955 + ... + 231688.

It is an arithmetic number, because the mean of its divisors is an integer number (157540248).

Almost surely, 2^629698981 is an apocalyptic number.

It is an amenable number.

629698981 is a deficient number, since it is larger than the sum of its proper divisors (462011).

629698981 is a wasteful number, since it uses less digits than its factorization.

629698981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 462010.

The product of its digits is 3359232, while the sum is 58.

The square root of 629698981 is about 25093.8036375516. The cubic root of 629698981 is about 857.1253309684.

The spelling of 629698981 in words is "six hundred twenty-nine million, six hundred ninety-eight thousand, nine hundred eighty-one".