1161010721 has 16 divisors (see below), whose sum is σ = 1307034624. Its totient is φ = 1023257664.

The previous prime is 1161010709. The next prime is 1161010757. The reversal of 1161010721 is 1270101611.

It is a happy number.

It is not a de Polignac number, because 1161010721 - 2⁶ = 1161010657 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1161010693 and 1161010702.

It is not an unprimeable number, because it can be changed into a prime (1161010021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 178295 + ... + 184691.

It is an arithmetic number, because the mean of its divisors is an integer number (81689664).

Almost surely, 2^1161010721 is an apocalyptic number.

It is an amenable number.

1161010721 is a deficient number, since it is larger than the sum of its proper divisors (146023903).

1161010721 is a wasteful number, since it uses less digits than its factorization.

1161010721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7040.

The product of its (nonzero) digits is 84, while the sum is 20.

The square root of 1161010721 is about 34073.6073963412. The cubic root of 1161010721 is about 1051.0226532422.

The spelling of 1161010721 in words is "one billion, one hundred sixty-one million, ten thousand, seven hundred twenty-one".