1156128613 has 2 divisors, whose sum is σ = 1156128614. Its totient is φ = 1156128612.

The previous prime is 1156128593. The next prime is 1156128629. The reversal of 1156128613 is 3168216511.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1042450369 + 113678244 = 32287^2 + 10662^2 .

It is a cyclic number.

It is not a de Polignac number, because 1156128613 - 2¹⁷ = 1155997541 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1156128643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 578064306 + 578064307.

It is an arithmetic number, because the mean of its divisors is an integer number (578064307).

Almost surely, 2^1156128613 is an apocalyptic number.

It is an amenable number.

1156128613 is a deficient number, since it is larger than the sum of its proper divisors (1).

1156128613 is an equidigital number, since it uses as much as digits as its factorization.

1156128613 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8640, while the sum is 34.

The square root of 1156128613 is about 34001.8913150431. The cubic root of 1156128613 is about 1049.5473825474.

The spelling of 1156128613 in words is "one billion, one hundred fifty-six million, one hundred twenty-eight thousand, six hundred thirteen".