1187422681 has 9 divisors (see below), whose sum is σ = 1262002399. Its totient is φ = 1117022944.

The previous prime is 1187422669. The next prime is 1187422697. The reversal of 1187422681 is 1862247811.

The square root of 1187422681 is 34459.

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

It can be written as a sum of positive squares in only one way, i.e., 924464025 + 262958656 = 30405^2 + 16216^2 .

It is not a de Polignac number, because 1187422681 - 2⁷ = 1187422553 is a prime.

It is a super-2 number, since 2×1187422681² = 2819945246706455522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1187422631) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 584790 + ... + 586816.

Almost surely, 2^1187422681 is an apocalyptic number.

1187422681 is the 34459-th square number.

1187422681 is the 17230-th centered octagonal number.

It is an amenable number.

1187422681 is a deficient number, since it is larger than the sum of its proper divisors (74579718).

1187422681 is an frugal number, since it uses more digits than its factorization.

1187422681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4088 (or 2044 counting only the distinct ones).

The product of its digits is 43008, while the sum is 40.

The cubic root of 1187422681 is about 1058.9329124320.

The spelling of 1187422681 in words is "one billion, one hundred eighty-seven million, four hundred twenty-two thousand, six hundred eighty-one".