1220433202531 has 4 divisors (see below), whose sum is σ = 1284666529000. Its totient is φ = 1156199876064.

The previous prime is 1220433202441. The next prime is 1220433202591. The reversal of 1220433202531 is 1352023340221.

It is a happy number.

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

It is not a de Polignac number, because 1220433202531 - 2⁷ = 1220433202403 is a prime.

It is a super-2 number, since 2×1220433202531² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1220433202531.

It is not an unprimeable number, because it can be changed into a prime (1220433202591) 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, 32116663206 + ... + 32116663243.

It is an arithmetic number, because the mean of its divisors is an integer number (321166632250).

Almost surely, 2^{1220433202531} is an apocalyptic number.

1220433202531 is a deficient number, since it is larger than the sum of its proper divisors (64233326469).

1220433202531 is an equidigital number, since it uses as much as digits as its factorization.

1220433202531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64233326468.

The product of its (nonzero) digits is 8640, while the sum is 28.

Adding to 1220433202531 its reverse (1352023340221), we get a palindrome (2572456542752).

The spelling of 1220433202531 in words is "one trillion, two hundred twenty billion, four hundred thirty-three million, two hundred two thousand, five hundred thirty-one".