1215444540031 has 4 divisors (see below), whose sum is σ = 1215450522000. Its totient is φ = 1215438558064.

The previous prime is 1215444540017. The next prime is 1215444540053. The reversal of 1215444540031 is 1300454445121.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1215444540031 is a prime.

It is a super-2 number, since 2×1215444540031² (a number of 25 digits) 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 (1215444549031) 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, 2675086 + ... + 3096283.

It is an arithmetic number, because the mean of its divisors is an integer number (303862630500).

Almost surely, 2^{1215444540031} is an apocalyptic number.

1215444540031 is a deficient number, since it is larger than the sum of its proper divisors (5981969).

1215444540031 is an equidigital number, since it uses as much as digits as its factorization.

1215444540031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5981968.

The product of its (nonzero) digits is 38400, while the sum is 34.

Adding to 1215444540031 its reverse (1300454445121), we get a palindrome (2515898985152).

The spelling of 1215444540031 in words is "one trillion, two hundred fifteen billion, four hundred forty-four million, five hundred forty thousand, thirty-one".