1151540261 has 4 divisors (see below), whose sum is σ = 1166116800. Its totient is φ = 1136963724.

The previous prime is 1151540251. The next prime is 1151540263. The reversal of 1151540261 is 1620451511.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1151540261 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1151540261.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1151540263) 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, 7288151 + ... + 7288308.

It is an arithmetic number, because the mean of its divisors is an integer number (291529200).

Almost surely, 2^1151540261 is an apocalyptic number.

It is an amenable number.

1151540261 is a deficient number, since it is larger than the sum of its proper divisors (14576539).

1151540261 is an equidigital number, since it uses as much as digits as its factorization.

1151540261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14576538.

The product of its (nonzero) digits is 1200, while the sum is 26.

The square root of 1151540261 is about 33934.3522260261. The cubic root of 1151540261 is about 1048.1570880839.

Adding to 1151540261 its reverse (1620451511), we get a palindrome (2771991772).

The spelling of 1151540261 in words is "one billion, one hundred fifty-one million, five hundred forty thousand, two hundred sixty-one".