1215030401231 has 4 divisors (see below), whose sum is σ = 1286502777792. Its totient is φ = 1143558024672.

The previous prime is 1215030401213. The next prime is 1215030401257. The reversal of 1215030401231 is 1321040305121.

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-1215030401231 is a prime.

It is a super-2 number, since 2×1215030401231² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1215030401197 and 1215030401206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1215030401531) 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, 35736188255 + ... + 35736188288.

It is an arithmetic number, because the mean of its divisors is an integer number (321625694448).

Almost surely, 2^{1215030401231} is an apocalyptic number.

1215030401231 is a deficient number, since it is larger than the sum of its proper divisors (71472376561).

1215030401231 is an equidigital number, since it uses as much as digits as its factorization.

1215030401231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71472376560.

The product of its (nonzero) digits is 720, while the sum is 23.

Adding to 1215030401231 its reverse (1321040305121), we get a palindrome (2536070706352).

The spelling of 1215030401231 in words is "one trillion, two hundred fifteen billion, thirty million, four hundred one thousand, two hundred thirty-one".