1188887461 has 2 divisors, whose sum is σ = 1188887462. Its totient is φ = 1188887460.

The previous prime is 1188887431. The next prime is 1188887471. The reversal of 1188887461 is 1647888811.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 691374436 + 497513025 = 26294^2 + 22305^2 .

It is a cyclic number.

It is not a de Polignac number, because 1188887461 - 2¹⁹ = 1188363173 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1188887399 and 1188887408.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1188887431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 594443730 + 594443731.

It is an arithmetic number, because the mean of its divisors is an integer number (594443731).

Almost surely, 2^1188887461 is an apocalyptic number.

It is an amenable number.

1188887461 is a deficient number, since it is larger than the sum of its proper divisors (1).

1188887461 is an equidigital number, since it uses as much as digits as its factorization.

1188887461 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 688128, while the sum is 52.

The square root of 1188887461 is about 34480.2474034047. The cubic root of 1188887461 is about 1059.3681594057.

The spelling of 1188887461 in words is "one billion, one hundred eighty-eight million, eight hundred eighty-seven thousand, four hundred sixty-one".