1161171554 has 4 divisors (see below), whose sum is σ = 1741757334. Its totient is φ = 580585776.

The previous prime is 1161171509. The next prime is 1161171589. The reversal of 1161171554 is 4551711611.

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

It can be written as a sum of positive squares in only one way, i.e., 1133870929 + 27300625 = 33673^2 + 5225^2 .

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 1161171554.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 290292887 + ... + 290292890.

Almost surely, 2^1161171554 is an apocalyptic number.

1161171554 is a deficient number, since it is larger than the sum of its proper divisors (580585780).

1161171554 is an equidigital number, since it uses as much as digits as its factorization.

1161171554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 580585779.

The product of its digits is 4200, while the sum is 32.

The square root of 1161171554 is about 34075.9673963924. The cubic root of 1161171554 is about 1051.0711831763.

The spelling of 1161171554 in words is "one billion, one hundred sixty-one million, one hundred seventy-one thousand, five hundred fifty-four".