1161419721 has 16 divisors (see below), whose sum is σ = 1930672128. Its totient is φ = 603334800.

The previous prime is 1161419711. The next prime is 1161419737. The reversal of 1161419721 is 1279141611.

It is not a de Polignac number, because 1161419721 - 2⁵ = 1161419689 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (1161419711) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 2513665 + ... + 2514126.

It is an arithmetic number, because the mean of its divisors is an integer number (120667008).

Almost surely, 2^1161419721 is an apocalyptic number.

1161419721 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1161419721 is a deficient number, since it is larger than the sum of its proper divisors (769252407).

1161419721 is a wasteful number, since it uses less digits than its factorization.

1161419721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5027812.

The product of its digits is 3024, while the sum is 33.

The square root of 1161419721 is about 34079.6085804987. The cubic root of 1161419721 is about 1051.1460565807.

The spelling of 1161419721 in words is "one billion, one hundred sixty-one million, four hundred nineteen thousand, seven hundred twenty-one".