1213864129 has 4 divisors (see below), whose sum is σ = 1214397184. Its totient is φ = 1213331076.

The previous prime is 1213864109. The next prime is 1213864181. The reversal of 1213864129 is 9214683121.

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, and also an emirpimes, since its reverse is a distinct semiprime: 9214683121 = 7 ⋅1316383303.

It is a cyclic number.

It is not a de Polignac number, because 1213864129 - 2²³ = 1205475521 is a prime.

It is a super-2 number, since 2×1213864129² = 2946932247345857282, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1213864109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 263097 + ... + 267670.

It is an arithmetic number, because the mean of its divisors is an integer number (303599296).

Almost surely, 2^1213864129 is an apocalyptic number.

It is an amenable number.

1213864129 is a deficient number, since it is larger than the sum of its proper divisors (533055).

1213864129 is an equidigital number, since it uses as much as digits as its factorization.

1213864129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 533054.

The product of its digits is 20736, while the sum is 37.

The square root of 1213864129 is about 34840.5529376329. The cubic root of 1213864129 is about 1066.7353632297.

It can be divided in two parts, 12138 and 64129, that added together give a palindrome (76267).

The spelling of 1213864129 in words is "one billion, two hundred thirteen million, eight hundred sixty-four thousand, one hundred twenty-nine".