1381194187 has 2 divisors, whose sum is σ = 1381194188. Its totient is φ = 1381194186.

The previous prime is 1381194077. The next prime is 1381194233. The reversal of 1381194187 is 7814911831.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1381194187 - 2¹¹ = 1381192139 is a prime.

It is not a weakly prime, because it can be changed into another prime (1381194887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 690597093 + 690597094.

It is an arithmetic number, because the mean of its divisors is an integer number (690597094).

Almost surely, 2^1381194187 is an apocalyptic number.

1381194187 is a deficient number, since it is larger than the sum of its proper divisors (1).

1381194187 is an equidigital number, since it uses as much as digits as its factorization.

1381194187 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48384, while the sum is 43.

The square root of 1381194187 is about 37164.4209829778. The cubic root of 1381194187 is about 1113.6573318576.

The spelling of 1381194187 in words is "one billion, three hundred eighty-one million, one hundred ninety-four thousand, one hundred eighty-seven".