1213203129 has 16 divisors (see below), whose sum is σ = 1635828480. Its totient is φ = 799719120.

The previous prime is 1213203119. The next prime is 1213203163. The reversal of 1213203129 is 9213023121.

It is not a de Polignac number, because 1213203129 - 2¹⁷ = 1213072057 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1213203099 and 1213203108.

It is not an unprimeable number, because it can be changed into a prime (1213203119) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 179982 + ... + 186600.

It is an arithmetic number, because the mean of its divisors is an integer number (102239280).

Almost surely, 2^1213203129 is an apocalyptic number.

It is an amenable number.

1213203129 is a deficient number, since it is larger than the sum of its proper divisors (422625351).

1213203129 is a wasteful number, since it uses less digits than its factorization.

1213203129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7300.

The product of its (nonzero) digits is 648, while the sum is 24.

The square root of 1213203129 is about 34831.0655737088. The cubic root of 1213203129 is about 1066.5417006704.

The spelling of 1213203129 in words is "one billion, two hundred thirteen million, two hundred three thousand, one hundred twenty-nine".