1150781551 has 4 divisors (see below), whose sum is σ = 1156235704. Its totient is φ = 1145327400.

The previous prime is 1150781539. The next prime is 1150781573. The reversal of 1150781551 is 1551870511.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1150781551 - 2²¹ = 1148684399 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1150781521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2726760 + ... + 2727181.

It is an arithmetic number, because the mean of its divisors is an integer number (289058926).

Almost surely, 2^1150781551 is an apocalyptic number.

1150781551 is a deficient number, since it is larger than the sum of its proper divisors (5454153).

1150781551 is an equidigital number, since it uses as much as digits as its factorization.

1150781551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5454152.

The product of its (nonzero) digits is 7000, while the sum is 34.

The square root of 1150781551 is about 33923.1712992757. The cubic root of 1150781551 is about 1047.9268393730.

The spelling of 1150781551 in words is "one billion, one hundred fifty million, seven hundred eighty-one thousand, five hundred fifty-one".