1151801856 has 100 divisors (see below), whose sum is σ = 3437949042. Its totient is φ = 383920128.

The previous prime is 1151801789. The next prime is 1151801857. The reversal of 1151801856 is 6581081511.

It can be written as a sum of positive squares in only one way, i.e., 923187456 + 228614400 = 30384^2 + 15120^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 1151801856.

It is not an unprimeable number, because it can be changed into a prime (1151801857) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 27586 + ... + 55358.

Almost surely, 2^1151801856 is an apocalyptic number.

1151801856 is a gapful number since it is divisible by the number (16) 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 1151801856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1718974521).

1151801856 is an abundant number, since it is smaller than the sum of its proper divisors (2286147186).

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

1151801856 is an frugal number, since it uses more digits than its factorization.

1151801856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27803 (or 27778 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 36.

The square root of 1151801856 is about 33938.2064346365. The cubic root of 1151801856 is about 1048.2364519014.

The spelling of 1151801856 in words is "one billion, one hundred fifty-one million, eight hundred one thousand, eight hundred fifty-six".