1215561114 has 32 divisors (see below), whose sum is σ = 2725165440. Its totient is φ = 401599296.

The previous prime is 1215561079. The next prime is 1215561131. The reversal of 1215561114 is 4111655121.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 93502 + ... + 105705.

It is an arithmetic number, because the mean of its divisors is an integer number (85161420).

Almost surely, 2^1215561114 is an apocalyptic number.

1215561114 is an abundant number, since it is smaller than the sum of its proper divisors (1509604326).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1215561114 is a wasteful number, since it uses less digits than its factorization.

1215561114 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199331 (or 199325 counting only the distinct ones).

The product of its digits is 1200, while the sum is 27.

The square root of 1215561114 is about 34864.8980207888. The cubic root of 1215561114 is about 1067.2322313034.

The spelling of 1215561114 in words is "one billion, two hundred fifteen million, five hundred sixty-one thousand, one hundred fourteen".