1228561215 has 64 divisors (see below), whose sum is σ = 2356273152. Its totient is φ = 534441600.

The previous prime is 1228561193. The next prime is 1228561241. The reversal of 1228561215 is 5121658221.

It is not a de Polignac number, because 1228561215 - 2⁵ = 1228561183 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 508360 + ... + 510770.

It is an arithmetic number, because the mean of its divisors is an integer number (36816768).

Almost surely, 2^1228561215 is an apocalyptic number.

1228561215 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1228561215 is a deficient number, since it is larger than the sum of its proper divisors (1127711937).

1228561215 is a wasteful number, since it uses less digits than its factorization.

1228561215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2660.

The product of its digits is 9600, while the sum is 33.

The square root of 1228561215 is about 35050.8375791507. The cubic root of 1228561215 is about 1071.0233360593.

The spelling of 1228561215 in words is "one billion, two hundred twenty-eight million, five hundred sixty-one thousand, two hundred fifteen".