1161274551 has 8 divisors (see below), whose sum is σ = 1549668720. Its totient is φ = 773531712.

The previous prime is 1161274549. The next prime is 1161274567. The reversal of 1161274551 is 1554721611.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1161274551 - 2¹ = 1161274549 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1161273551) 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 7 ways as a sum of consecutive naturals, for example, 158656 + ... + 165813.

It is an arithmetic number, because the mean of its divisors is an integer number (193708590).

Almost surely, 2^1161274551 is an apocalyptic number.

1161274551 is a deficient number, since it is larger than the sum of its proper divisors (388394169).

1161274551 is a wasteful number, since it uses less digits than its factorization.

1161274551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 325665.

The product of its digits is 8400, while the sum is 33.

The square root of 1161274551 is about 34077.4786479282. The cubic root of 1161274551 is about 1051.1022592556.

The spelling of 1161274551 in words is "one billion, one hundred sixty-one million, two hundred seventy-four thousand, five hundred fifty-one".