1222431212551 has 8 divisors (see below), whose sum is σ = 1264393280000. Its totient is φ = 1180627195320.

The previous prime is 1222431212537. The next prime is 1222431212573. The reversal of 1222431212551 is 1552121342221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1222431212551 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1222431212521) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39496821 + ... + 39527758.

It is an arithmetic number, because the mean of its divisors is an integer number (158049160000).

Almost surely, 2^{1222431212551} is an apocalyptic number.

1222431212551 is a deficient number, since it is larger than the sum of its proper divisors (41962067449).

1222431212551 is an equidigital number, since it uses as much as digits as its factorization.

1222431212551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79025109.

The product of its digits is 9600, while the sum is 31.

Adding to 1222431212551 its reverse (1552121342221), we get a palindrome (2774552554772).

The spelling of 1222431212551 in words is "one trillion, two hundred twenty-two billion, four hundred thirty-one million, two hundred twelve thousand, five hundred fifty-one".