1161363721 has 8 divisors (see below), whose sum is σ = 1405347840. Its totient is φ = 936898368.

The previous prime is 1161363683. The next prime is 1161363781. The reversal of 1161363721 is 1273631611.

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

It is not a de Polignac number, because 1161363721 - 2¹³ = 1161355529 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1161363781) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4879561 + ... + 4879798.

It is an arithmetic number, because the mean of its divisors is an integer number (175668480).

Almost surely, 2^1161363721 is an apocalyptic number.

It is an amenable number.

1161363721 is a deficient number, since it is larger than the sum of its proper divisors (243984119).

1161363721 is an equidigital number, since it uses as much as digits as its factorization.

1161363721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9759383.

The product of its digits is 4536, while the sum is 31.

The square root of 1161363721 is about 34078.7869649141. The cubic root of 1161363721 is about 1051.1291619921.

It can be divided in two parts, 1161363 and 721, that added together give a square (1162084 = 1078²).

The spelling of 1161363721 in words is "one billion, one hundred sixty-one million, three hundred sixty-three thousand, seven hundred twenty-one".