1188939361 has 15 divisors (see below), whose sum is σ = 1262168143. Its totient is φ = 1119942880.

The previous prime is 1188939343. The next prime is 1188939371. The reversal of 1188939361 is 1639398811.

The square root of 1188939361 is 34481.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 7 ways, for example, as 1104299361 + 84640000 = 33231^2 + 9200^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1188939361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1188939371) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 28998501 + ... + 28998541.

Almost surely, 2^1188939361 is an apocalyptic number.

1188939361 is the 34481-st square number.

1188939361 is the 17241-st centered octagonal number.

It is an amenable number.

1188939361 is a deficient number, since it is larger than the sum of its proper divisors (73228782).

1188939361 is an frugal number, since it uses more digits than its factorization.

1188939361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198 (or 70 counting only the distinct ones).

The product of its digits is 279936, while the sum is 49.

The cubic root of 1188939361 is about 1059.3835744917.

Multiplying 1188939361 by its sum of digits (49), we get a square (58258028689 = 241367²).

The spelling of 1188939361 in words is "one billion, one hundred eighty-eight million, nine hundred thirty-nine thousand, three hundred sixty-one".