18861461 has 2 divisors, whose sum is σ = 18861462. Its totient is φ = 18861460.

The previous prime is 18861457. The next prime is 18861499. The reversal of 18861461 is 16416881.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16859236 + 2002225 = 4106^2 + 1415^2 .

It is a cyclic number.

It is not a de Polignac number, because 18861461 - 2² = 18861457 is a prime.

It is a super-2 number, since 2×18861461² = 711509422109042, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18861421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9430730 + 9430731.

It is an arithmetic number, because the mean of its divisors is an integer number (9430731).

Almost surely, 2^18861461 is an apocalyptic number.

It is an amenable number.

18861461 is a deficient number, since it is larger than the sum of its proper divisors (1).

18861461 is an equidigital number, since it uses as much as digits as its factorization.

18861461 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9216, while the sum is 35.

The square root of 18861461 is about 4342.9783559212. The cubic root of 18861461 is about 266.1900247698.

The spelling of 18861461 in words is "eighteen million, eight hundred sixty-one thousand, four hundred sixty-one".