1161537251 has 4 divisors (see below), whose sum is σ = 1327471152. Its totient is φ = 995603352.

The previous prime is 1161537227. The next prime is 1161537281. The reversal of 1161537251 is 1527351611.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1527351611 = 61 ⋅25038551.

It is a cyclic number.

It is not a de Polignac number, because 1161537251 - 2²² = 1157342947 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1161537281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 82966940 + ... + 82966953.

It is an arithmetic number, because the mean of its divisors is an integer number (331867788).

Almost surely, 2^1161537251 is an apocalyptic number.

1161537251 is a deficient number, since it is larger than the sum of its proper divisors (165933901).

1161537251 is an equidigital number, since it uses as much as digits as its factorization.

1161537251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165933900.

The product of its digits is 6300, while the sum is 32.

The square root of 1161537251 is about 34081.3328817991. The cubic root of 1161537251 is about 1051.1815123328.

Adding to 1161537251 its reverse (1527351611), we get a palindrome (2688888862).

The spelling of 1161537251 in words is "one billion, one hundred sixty-one million, five hundred thirty-seven thousand, two hundred fifty-one".