1220515012531 has 8 divisors (see below), whose sum is σ = 1228128092000. Its totient is φ = 1212916731840.

The previous prime is 1220515012511. The next prime is 1220515012573. The reversal of 1220515012531 is 1352105150221.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1220515012531 - 2⁵ = 1220515012499 is a prime.

It is a super-2 number, since 2×1220515012531² (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 1220515012531.

It is not an unprimeable number, because it can be changed into a prime (1220515012511) 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, 3534210 + ... + 3864151.

It is an arithmetic number, because the mean of its divisors is an integer number (153516011500).

Almost surely, 2^{1220515012531} is an apocalyptic number.

1220515012531 is a deficient number, since it is larger than the sum of its proper divisors (7613079469).

1220515012531 is an equidigital number, since it uses as much as digits as its factorization.

1220515012531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7399389.

The product of its (nonzero) digits is 3000, while the sum is 28.

The spelling of 1220515012531 in words is "one trillion, two hundred twenty billion, five hundred fifteen million, twelve thousand, five hundred thirty-one".