629090909 has 4 divisors (see below), whose sum is σ = 646093404. Its totient is φ = 612088416.

The previous prime is 629090897. The next prime is 629090927. The reversal of 629090909 is 909090926.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 909090926 = 2 ⋅454545463.

It can be written as a sum of positive squares in 2 ways, for example, as 361114009 + 267976900 = 19003^2 + 16370^2 .

It is a cyclic number.

It is not a de Polignac number, because 629090909 - 2²⁴ = 612313693 is a prime.

It is a Duffinian number.

629090909 is a modest number, since divided by 90909 gives 629 as remainder.

It is a self number, because there is not a number n which added to its sum of digits gives 629090909.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (629090929) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8501192 + ... + 8501265.

It is an arithmetic number, because the mean of its divisors is an integer number (161523351).

Almost surely, 2^629090909 is an apocalyptic number.

It is an amenable number.

629090909 is a deficient number, since it is larger than the sum of its proper divisors (17002495).

629090909 is a wasteful number, since it uses less digits than its factorization.

629090909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17002494.

The product of its (nonzero) digits is 78732, while the sum is 44.

The square root of 629090909 is about 25081.6847320909. The cubic root of 629090909 is about 856.8493463130.

The spelling of 629090909 in words is "six hundred twenty-nine million, ninety thousand, nine hundred nine".