1156172023 has 8 divisors (see below), whose sum is σ = 1241425440. Its totient is φ = 1072834560.

The previous prime is 1156172009. The next prime is 1156172053. The reversal of 1156172023 is 3202716511.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1156172023 - 2¹³ = 1156163831 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1156171982 and 1156172000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1156172053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 477738 + ... + 480151.

It is an arithmetic number, because the mean of its divisors is an integer number (155178180).

Almost surely, 2^1156172023 is an apocalyptic number.

1156172023 is a deficient number, since it is larger than the sum of its proper divisors (85253417).

1156172023 is an equidigital number, since it uses as much as digits as its factorization.

1156172023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 957977.

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 1156172023 is about 34002.5296558947. The cubic root of 1156172023 is about 1049.5605184221.

Adding to 1156172023 its reverse (3202716511), we get a palindrome (4358888534).

The spelling of 1156172023 in words is "one billion, one hundred fifty-six million, one hundred seventy-two thousand, twenty-three".