1215887255 has 12 divisors (see below), whose sum is σ = 1603766136. Its totient is φ = 884281200.

The previous prime is 1215887251. The next prime is 1215887269. The reversal of 1215887255 is 5527885121.

It is a happy number.

It is not a de Polignac number, because 1215887255 - 2² = 1215887251 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 (1215887251) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1004261 + ... + 1005470.

It is an arithmetic number, because the mean of its divisors is an integer number (133647178).

Almost surely, 2^1215887255 is an apocalyptic number.

1215887255 is a deficient number, since it is larger than the sum of its proper divisors (387878881).

1215887255 is a wasteful number, since it uses less digits than its factorization.

1215887255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2009758 (or 2009747 counting only the distinct ones).

The product of its digits is 224000, while the sum is 44.

The square root of 1215887255 is about 34869.5749185447. The cubic root of 1215887255 is about 1067.3276706464.

The spelling of 1215887255 in words is "one billion, two hundred fifteen million, eight hundred eighty-seven thousand, two hundred fifty-five".