1161556374 has 64 divisors (see below), whose sum is σ = 2718178560. Its totient is φ = 327150720.

The previous prime is 1161556367. The next prime is 1161556381. The reversal of 1161556374 is 4736551611.

It is an interprime number because it is at equal distance from previous prime (1161556367) and next prime (1161556381).

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 57724 + ... + 75200.

It is an arithmetic number, because the mean of its divisors is an integer number (42471540).

Almost surely, 2^1161556374 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1161556374, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1359089280).

1161556374 is an abundant number, since it is smaller than the sum of its proper divisors (1556622186).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1161556374 is a wasteful number, since it uses less digits than its factorization.

1161556374 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17565.

The product of its digits is 75600, while the sum is 39.

The square root of 1161556374 is about 34081.6134301180. The cubic root of 1161556374 is about 1051.1872810196.

The spelling of 1161556374 in words is "one billion, one hundred sixty-one million, five hundred fifty-six thousand, three hundred seventy-four".