1156118921 has 2 divisors, whose sum is σ = 1156118922. Its totient is φ = 1156118920.

The previous prime is 1156118917. The next prime is 1156118927. The reversal of 1156118921 is 1298116511.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1129699321 + 26419600 = 33611^2 + 5140^2 .

It is a cyclic number.

It is not a de Polignac number, because 1156118921 - 2² = 1156118917 is a prime.

It is a super-2 number, since 2×1156118921² = 2673221918988408482, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1156118927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 578059460 + 578059461.

It is an arithmetic number, because the mean of its divisors is an integer number (578059461).

Almost surely, 2^1156118921 is an apocalyptic number.

It is an amenable number.

1156118921 is a deficient number, since it is larger than the sum of its proper divisors (1).

1156118921 is an equidigital number, since it uses as much as digits as its factorization.

1156118921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4320, while the sum is 35.

The square root of 1156118921 is about 34001.7487932606. The cubic root of 1156118921 is about 1049.5444497014.

The spelling of 1156118921 in words is "one billion, one hundred fifty-six million, one hundred eighteen thousand, nine hundred twenty-one".