1215541854 has 24 divisors (see below), whose sum is σ = 2788596720. Its totient is φ = 381346368.

The previous prime is 1215541849. The next prime is 1215541897. The reversal of 1215541854 is 4581455121.

1215541854 is a `hidden beast` number, since 1 + 21 + 554 + 1 + 85 + 4 = 666.

1215541854 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1985874 + ... + 1986485.

It is an arithmetic number, because the mean of its divisors is an integer number (116191530).

Almost surely, 2^1215541854 is an apocalyptic number.

1215541854 is an abundant number, since it is smaller than the sum of its proper divisors (1573054866).

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

1215541854 is a wasteful number, since it uses less digits than its factorization.

1215541854 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3972384 (or 3972381 counting only the distinct ones).

The product of its digits is 32000, while the sum is 36.

The square root of 1215541854 is about 34864.6218106550. The cubic root of 1215541854 is about 1067.2265946743.

Adding to 1215541854 its reverse (4581455121), we get a palindrome (5796996975).

The spelling of 1215541854 in words is "one billion, two hundred fifteen million, five hundred forty-one thousand, eight hundred fifty-four".