1158173813 has 2 divisors, whose sum is σ = 1158173814. Its totient is φ = 1158173812.

The previous prime is 1158173801. The next prime is 1158173837. The reversal of 1158173813 is 3183718511.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1157496484 + 677329 = 34022^2 + 823^2 .

It is a cyclic number.

It is not a de Polignac number, because 1158173813 - 2¹² = 1158169717 is a prime.

It is a super-2 number, since 2×1158173813² = 2682733162237917938, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1158173713) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 579086906 + 579086907.

It is an arithmetic number, because the mean of its divisors is an integer number (579086907).

Almost surely, 2^1158173813 is an apocalyptic number.

It is an amenable number.

1158173813 is a deficient number, since it is larger than the sum of its proper divisors (1).

1158173813 is an equidigital number, since it uses as much as digits as its factorization.

1158173813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20160, while the sum is 38.

The square root of 1158173813 is about 34031.9528237802. The cubic root of 1158173813 is about 1050.1659036417.

The spelling of 1158173813 in words is "one billion, one hundred fifty-eight million, one hundred seventy-three thousand, eight hundred thirteen".