1204999129 has 2 divisors, whose sum is σ = 1204999130. Its totient is φ = 1204999128.

The previous prime is 1204999121. The next prime is 1204999139. The reversal of 1204999129 is 9219994021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 762864400 + 442134729 = 27620^2 + 21027^2 .

It is a cyclic number.

It is not a de Polignac number, because 1204999129 - 2³ = 1204999121 is a prime.

It is not a weakly prime, because it can be changed into another prime (1204999121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 602499564 + 602499565.

It is an arithmetic number, because the mean of its divisors is an integer number (602499565).

Almost surely, 2^1204999129 is an apocalyptic number.

It is an amenable number.

1204999129 is a deficient number, since it is larger than the sum of its proper divisors (1).

1204999129 is an equidigital number, since it uses as much as digits as its factorization.

1204999129 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 104976, while the sum is 46.

The square root of 1204999129 is about 34713.0973697249. The cubic root of 1204999129 is about 1064.1321823198.

It can be divided in two parts, 1204999 and 129, that added together give a triangular number (1205128 = T₁₅₅₂).

The spelling of 1204999129 in words is "one billion, two hundred four million, nine hundred ninety-nine thousand, one hundred twenty-nine".