1187801 has 2 divisors, whose sum is σ = 1187802. Its totient is φ = 1187800.

The previous prime is 1187761. The next prime is 1187803. The reversal of 1187801 is 1087811.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 952576 + 235225 = 976^2 + 485^2 .

It is an emirp because it is prime and its reverse (1087811) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1187801 is a prime.

It is a Sophie Germain prime.

Together with 1187803, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1187803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 593900 + 593901.

It is an arithmetic number, because the mean of its divisors is an integer number (593901).

2^1187801 is an apocalyptic number.

It is an amenable number.

1187801 is a deficient number, since it is larger than the sum of its proper divisors (1).

1187801 is an equidigital number, since it uses as much as digits as its factorization.

1187801 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 448, while the sum is 26.

The square root of 1187801 is about 1089.8628354064. The cubic root of 1187801 is about 105.9045360989.

The spelling of 1187801 in words is "one million, one hundred eighty-seven thousand, eight hundred one".