1156256945 has 4 divisors (see below), whose sum is σ = 1387508340. Its totient is φ = 925005552.

The previous prime is 1156256929. The next prime is 1156256947. The reversal of 1156256945 is 5496526511.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 611127841 + 545129104 = 24721^2 + 23348^2 .

It is a cyclic number.

It is not a de Polignac number, because 1156256945 - 2⁴ = 1156256929 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1156256896 and 1156256905.

It is not an unprimeable number, because it can be changed into a prime (1156256947) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 115625690 + ... + 115625699.

It is an arithmetic number, because the mean of its divisors is an integer number (346877085).

Almost surely, 2^1156256945 is an apocalyptic number.

It is an amenable number.

1156256945 is a deficient number, since it is larger than the sum of its proper divisors (231251395).

1156256945 is an equidigital number, since it uses as much as digits as its factorization.

1156256945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 231251394.

The product of its digits is 324000, while the sum is 44.

The square root of 1156256945 is about 34003.7783929963. The cubic root of 1156256945 is about 1049.5862148855.

The spelling of 1156256945 in words is "one billion, one hundred fifty-six million, two hundred fifty-six thousand, nine hundred forty-five".