1212402431 has 4 divisors (see below), whose sum is σ = 1241973264. Its totient is φ = 1182831600.

The previous prime is 1212402409. The next prime is 1212402479. The reversal of 1212402431 is 1342042121.

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 1212402431 - 2¹⁴ = 1212386047 is a prime.

It is a super-2 number, since 2×1212402431² = 2939839309389419522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212402491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14785355 + ... + 14785436.

It is an arithmetic number, because the mean of its divisors is an integer number (310493316).

Almost surely, 2^1212402431 is an apocalyptic number.

1212402431 is a deficient number, since it is larger than the sum of its proper divisors (29570833).

1212402431 is an equidigital number, since it uses as much as digits as its factorization.

1212402431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29570832.

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 1212402431 is about 34819.5696555831. The cubic root of 1212402431 is about 1066.3070145665.

Adding to 1212402431 its reverse (1342042121), we get a palindrome (2554444552).

The spelling of 1212402431 in words is "one billion, two hundred twelve million, four hundred two thousand, four hundred thirty-one".