1151581536 has 180 divisors, whose sum is σ = 3940145748. Its totient is φ = 328987008.

The previous prime is 1151581523. The next prime is 1151581559. The reversal of 1151581536 is 6351851511.

It is a happy number.

1151581536 is a `hidden beast` number, since 11 + 515 + 81 + 53 + 6 = 666.

It is a super-2 number, since 2×1151581536² = 2652280068112238592, which contains 22 as substring.

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 1151581536.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 122475 + ... + 131541.

Almost surely, 2^1151581536 is an apocalyptic number.

1151581536 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 1151581536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1970072874).

1151581536 is an abundant number, since it is smaller than the sum of its proper divisors (2788564212).

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

1151581536 is an equidigital number, since it uses as much as digits as its factorization.

1151581536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9103 (or 9079 counting only the distinct ones).

The product of its digits is 18000, while the sum is 36.

The square root of 1151581536 is about 33934.9603801154. The cubic root of 1151581536 is about 1048.1696110697.

The spelling of 1151581536 in words is "one billion, one hundred fifty-one million, five hundred eighty-one thousand, five hundred thirty-six".