1161325551 has 4 divisors (see below), whose sum is σ = 1548434072. Its totient is φ = 774217032.

The previous prime is 1161325541. The next prime is 1161325577. The reversal of 1161325551 is 1555231611.

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

It is not a de Polignac number, because 1161325551 - 2⁷ = 1161325423 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 (1161325531) 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, 193554256 + ... + 193554261.

It is an arithmetic number, because the mean of its divisors is an integer number (387108518).

Almost surely, 2^1161325551 is an apocalyptic number.

1161325551 is a deficient number, since it is larger than the sum of its proper divisors (387108521).

1161325551 is an equidigital number, since it uses as much as digits as its factorization.

1161325551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 387108520.

The product of its digits is 4500, while the sum is 30.

The square root of 1161325551 is about 34078.2269345105. The cubic root of 1161325551 is about 1051.1176462086.

The spelling of 1161325551 in words is "one billion, one hundred sixty-one million, three hundred twenty-five thousand, five hundred fifty-one".