1820628629 has 2 divisors, whose sum is σ = 1820628630. Its totient is φ = 1820628628.

The previous prime is 1820628611. The next prime is 1820628661. The reversal of 1820628629 is 9268260281.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1562383729 + 258244900 = 39527^2 + 16070^2 .

It is a cyclic number.

It is not a de Polignac number, because 1820628629 - 2²⁸ = 1552193173 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1820628629.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1820628829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 910314314 + 910314315.

It is an arithmetic number, because the mean of its divisors is an integer number (910314315).

Almost surely, 2^1820628629 is an apocalyptic number.

It is an amenable number.

1820628629 is a deficient number, since it is larger than the sum of its proper divisors (1).

1820628629 is an equidigital number, since it uses as much as digits as its factorization.

1820628629 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 165888, while the sum is 44.

The square root of 1820628629 is about 42668.8250248352. The cubic root of 1820628629 is about 1221.0697034320.

The spelling of 1820628629 in words is "one billion, eight hundred twenty million, six hundred twenty-eight thousand, six hundred twenty-nine".