1156557012 has 96 divisors (see below), whose sum is σ = 2985196032. Its totient is φ = 346285056.

The previous prime is 1156556993. The next prime is 1156557023. The reversal of 1156557012 is 2107556511.

It is a happy number.

1156557012 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 31 ways as a sum of consecutive naturals, for example, 1708018 + ... + 1708694.

It is an arithmetic number, because the mean of its divisors is an integer number (31095792).

Almost surely, 2^1156557012 is an apocalyptic number.

1156557012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1156557012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1492598016).

1156557012 is an abundant number, since it is smaller than the sum of its proper divisors (1828639020).

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

1156557012 is a wasteful number, since it uses less digits than its factorization.

1156557012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 977 (or 975 counting only the distinct ones).

The product of its (nonzero) digits is 10500, while the sum is 33.

The square root of 1156557012 is about 34008.1903664397. The cubic root of 1156557012 is about 1049.6770017841.

The spelling of 1156557012 in words is "one billion, one hundred fifty-six million, five hundred fifty-seven thousand, twelve".