1215340625 has 24 divisors (see below), whose sum is σ = 1608506424. Its totient is φ = 915040000.

The previous prime is 1215340589. The next prime is 1215340627. The reversal of 1215340625 is 5260435121.

It can be written as a sum of positive squares in 12 ways, for example, as 1026113089 + 189227536 = 32033^2 + 13756^2 .

It is not a de Polignac number, because 1215340625 - 2¹⁴ = 1215324241 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1215340627) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 41687 + ... + 64563.

It is an arithmetic number, because the mean of its divisors is an integer number (67021101).

Almost surely, 2^1215340625 is an apocalyptic number.

It is an amenable number.

1215340625 is a deficient number, since it is larger than the sum of its proper divisors (393165799).

1215340625 is an frugal number, since it uses more digits than its factorization.

1215340625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22919 (or 22899 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 1215340625 is about 34861.7358288425. The cubic root of 1215340625 is about 1067.1676994605.

Adding to 1215340625 its reverse (5260435121), we get a palindrome (6475775746).

The spelling of 1215340625 in words is "one billion, two hundred fifteen million, three hundred forty thousand, six hundred twenty-five".