7187861 has 2 divisors, whose sum is σ = 7187862. Its totient is φ = 7187860.

The previous prime is 7187857. The next prime is 7187881. The reversal of 7187861 is 1687817.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7187761 + 100 = 2681^2 + 10^2 .

It is a cyclic number.

It is not a de Polignac number, because 7187861 - 2² = 7187857 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7187801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3593930 + 3593931.

It is an arithmetic number, because the mean of its divisors is an integer number (3593931).

Almost surely, 2^7187861 is an apocalyptic number.

It is an amenable number.

7187861 is a deficient number, since it is larger than the sum of its proper divisors (1).

7187861 is an equidigital number, since it uses as much as digits as its factorization.

7187861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18816, while the sum is 38.

The square root of 7187861 is about 2681.0186496927. The cubic root of 7187861 is about 192.9892966583.

The spelling of 7187861 in words is "seven million, one hundred eighty-seven thousand, eight hundred sixty-one".