1156564542 has 96 divisors (see below), whose sum is σ = 2849489280. Its totient is φ = 311169600.

The previous prime is 1156564517. The next prime is 1156564571. The reversal of 1156564542 is 2454656511.

It is a self number, because there is not a number n which added to its sum of digits gives 1156564542.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1099917 + ... + 1100967.

It is an arithmetic number, because the mean of its divisors is an integer number (29682180).

Almost surely, 2^1156564542 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1156564542, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1424744640).

1156564542 is an abundant number, since it is smaller than the sum of its proper divisors (1692924738).

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

1156564542 is a wasteful number, since it uses less digits than its factorization.

1156564542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1286 (or 1279 counting only the distinct ones).

The product of its digits is 144000, while the sum is 39.

The square root of 1156564542 is about 34008.3010748846. The cubic root of 1156564542 is about 1049.6792798245.

The spelling of 1156564542 in words is "one billion, one hundred fifty-six million, five hundred sixty-four thousand, five hundred forty-two".