1213423513 has 4 divisors (see below), whose sum is σ = 1214530740. Its totient is φ = 1212316288.

The previous prime is 1213423469. The next prime is 1213423531. The reversal of 1213423513 is 3153243121.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 108326464 + 1105097049 = 10408^2 + 33243^2 .

It is a cyclic number.

It is not a de Polignac number, because 1213423513 - 2¹⁷ = 1213292441 is a prime.

It is a super-2 number, since 2×1213423513² = 2944793243802522338, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1213423553) 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, 551968 + ... + 554161.

It is an arithmetic number, because the mean of its divisors is an integer number (303632685).

Almost surely, 2^1213423513 is an apocalyptic number.

It is an amenable number.

1213423513 is a deficient number, since it is larger than the sum of its proper divisors (1107227).

1213423513 is a wasteful number, since it uses less digits than its factorization.

1213423513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1107226.

The product of its digits is 2160, while the sum is 25.

The square root of 1213423513 is about 34834.2290427103. The cubic root of 1213423513 is about 1066.6062775165.

Adding to 1213423513 its reverse (3153243121), we get a palindrome (4366666634).

The spelling of 1213423513 in words is "one billion, two hundred thirteen million, four hundred twenty-three thousand, five hundred thirteen".