1156730121 has 12 divisors (see below), whose sum is σ = 1671129460. Its totient is φ = 771016320.

The previous prime is 1156730101. The next prime is 1156730123. The reversal of 1156730121 is 1210376511.

It can be written as a sum of positive squares in 2 ways, for example, as 948332025 + 208398096 = 30795^2 + 14436^2 .

It is not a de Polignac number, because 1156730121 - 2¹⁰ = 1156729097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1156730123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 83661 + ... + 96501.

Almost surely, 2^1156730121 is an apocalyptic number.

It is an amenable number.

1156730121 is a deficient number, since it is larger than the sum of its proper divisors (514399339).

1156730121 is a wasteful number, since it uses less digits than its factorization.

1156730121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22856 (or 22853 counting only the distinct ones).

The product of its (nonzero) digits is 1260, while the sum is 27.

The square root of 1156730121 is about 34010.7353787006. The cubic root of 1156730121 is about 1049.7293697087.

The spelling of 1156730121 in words is "one billion, one hundred fifty-six million, seven hundred thirty thousand, one hundred twenty-one".