1187685013 has 2 divisors, whose sum is σ = 1187685014. Its totient is φ = 1187685012.

The previous prime is 1187685011. The next prime is 1187685019. The reversal of 1187685013 is 3105867811.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 969886449 + 217798564 = 31143^2 + 14758^2 .

It is a cyclic number.

It is not a de Polignac number, because 1187685013 - 2¹ = 1187685011 is a prime.

Together with 1187685011, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1187685011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 593842506 + 593842507.

It is an arithmetic number, because the mean of its divisors is an integer number (593842507).

Almost surely, 2^1187685013 is an apocalyptic number.

It is an amenable number.

1187685013 is a deficient number, since it is larger than the sum of its proper divisors (1).

1187685013 is an equidigital number, since it uses as much as digits as its factorization.

1187685013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40320, while the sum is 40.

The square root of 1187685013 is about 34462.8062264233. The cubic root of 1187685013 is about 1059.0108884660.

The spelling of 1187685013 in words is "one billion, one hundred eighty-seven million, six hundred eighty-five thousand, thirteen".