1215701056 has 14 divisors (see below), whose sum is σ = 2412406910. Its totient is φ = 607850496.

The previous prime is 1215701027. The next prime is 1215701063. The reversal of 1215701056 is 6501075121.

It can be written as a sum of positive squares in only one way, i.e., 1194393600 + 21307456 = 34560^2 + 4616^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9497601 + ... + 9497728.

Almost surely, 2^1215701056 is an apocalyptic number.

1215701056 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1215701056 is a deficient number, since it is larger than the sum of its proper divisors (1196705854).

1215701056 is an equidigital number, since it uses as much as digits as its factorization.

1215701056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18995341 (or 18995331 counting only the distinct ones).

The product of its (nonzero) digits is 2100, while the sum is 28.

The square root of 1215701056 is about 34866.9048812767. The cubic root of 1215701056 is about 1067.2731849229.

Adding to 1215701056 its reverse (6501075121), we get a palindrome (7716776177).

The spelling of 1215701056 in words is "one billion, two hundred fifteen million, seven hundred one thousand, fifty-six".