1187298881 has 2 divisors, whose sum is σ = 1187298882. Its totient is φ = 1187298880.

The previous prime is 1187298863. The next prime is 1187298907. The reversal of 1187298881 is 1888927811.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 933852481 + 253446400 = 30559^2 + 15920^2 .

It is a cyclic number.

It is not a de Polignac number, because 1187298881 - 2¹⁴ = 1187282497 is a prime.

It is a super-2 number, since 2×1187298881² = 2819357265647704322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1187298811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 593649440 + 593649441.

It is an arithmetic number, because the mean of its divisors is an integer number (593649441).

Almost surely, 2^1187298881 is an apocalyptic number.

It is an amenable number.

1187298881 is a deficient number, since it is larger than the sum of its proper divisors (1).

1187298881 is an equidigital number, since it uses as much as digits as its factorization.

1187298881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 516096, while the sum is 53.

The square root of 1187298881 is about 34457.2036154996. The cubic root of 1187298881 is about 1058.8961099092.

The spelling of 1187298881 in words is "one billion, one hundred eighty-seven million, two hundred ninety-eight thousand, eight hundred eighty-one".