1213121431 has 2 divisors, whose sum is σ = 1213121432. Its totient is φ = 1213121430.

The previous prime is 1213121423. The next prime is 1213121447. The reversal of 1213121431 is 1341213121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1213121431 - 2³ = 1213121423 is a prime.

It is a super-2 number, since 2×1213121431² = 2943327212702975522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1213121399 and 1213121408.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1213121471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606560715 + 606560716.

It is an arithmetic number, because the mean of its divisors is an integer number (606560716).

Almost surely, 2^1213121431 is an apocalyptic number.

1213121431 is a deficient number, since it is larger than the sum of its proper divisors (1).

1213121431 is an equidigital number, since it uses as much as digits as its factorization.

1213121431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 144, while the sum is 19.

The square root of 1213121431 is about 34829.8927790483. The cubic root of 1213121431 is about 1066.5177595629.

Adding to 1213121431 its reverse (1341213121), we get a palindrome (2554334552).

The spelling of 1213121431 in words is "one billion, two hundred thirteen million, one hundred twenty-one thousand, four hundred thirty-one".