18962681 has 2 divisors, whose sum is σ = 18962682. Its totient is φ = 18962680.

The previous prime is 18962663. The next prime is 18962687. The reversal of 18962681 is 18626981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14318656 + 4644025 = 3784^2 + 2155^2 .

It is a cyclic number.

It is not a de Polignac number, because 18962681 - 2¹⁸ = 18700537 is a prime.

It is a super-2 number, since 2×18962681² = 719166541415522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18962687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9481340 + 9481341.

It is an arithmetic number, because the mean of its divisors is an integer number (9481341).

Almost surely, 2^18962681 is an apocalyptic number.

It is an amenable number.

18962681 is a deficient number, since it is larger than the sum of its proper divisors (1).

18962681 is an equidigital number, since it uses as much as digits as its factorization.

18962681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 41472, while the sum is 41.

The square root of 18962681 is about 4354.6160565542. The cubic root of 18962681 is about 266.6653449587.

The spelling of 18962681 in words is "eighteen million, nine hundred sixty-two thousand, six hundred eighty-one".