1161558380 has 24 divisors (see below), whose sum is σ = 2440263840. Its totient is φ = 464434560.

The previous prime is 1161558379. The next prime is 1161558449. The reversal of 1161558380 is 838551611.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45416 + ... + 66224.

It is an arithmetic number, because the mean of its divisors is an integer number (101677660).

Almost surely, 2^1161558380 is an apocalyptic number.

1161558380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1161558380 is an abundant number, since it is smaller than the sum of its proper divisors (1278705460).

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

1161558380 is a wasteful number, since it uses less digits than its factorization.

1161558380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23609 (or 23607 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 38.

The square root of 1161558380 is about 34081.6428594632. The cubic root of 1161558380 is about 1051.1878861503.

The spelling of 1161558380 in words is "one billion, one hundred sixty-one million, five hundred fifty-eight thousand, three hundred eighty".