1213450431 has 4 divisors (see below), whose sum is σ = 1617933912. Its totient is φ = 808966952.

The previous prime is 1213450379. The next prime is 1213450439. The reversal of 1213450431 is 1340543121.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1213450431 - 2⁶ = 1213450367 is a prime.

It is a super-2 number, since 2×1213450431² = 2944923896988171522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213450439) 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, 202241736 + ... + 202241741.

It is an arithmetic number, because the mean of its divisors is an integer number (404483478).

Almost surely, 2^1213450431 is an apocalyptic number.

1213450431 is a deficient number, since it is larger than the sum of its proper divisors (404483481).

1213450431 is an equidigital number, since it uses as much as digits as its factorization.

1213450431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 404483480.

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 1213450431 is about 34834.6154134074. The cubic root of 1213450431 is about 1066.6141644840.

Adding to 1213450431 its reverse (1340543121), we get a palindrome (2553993552).

The spelling of 1213450431 in words is "one billion, two hundred thirteen million, four hundred fifty thousand, four hundred thirty-one".