17974981 has 2 divisors, whose sum is σ = 17974982. Its totient is φ = 17974980.

The previous prime is 17974963. The next prime is 17974991. The reversal of 17974981 is 18947971.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11390625 + 6584356 = 3375^2 + 2566^2 .

It is a cyclic number.

It is not a de Polignac number, because 17974981 - 2²³ = 9586373 is a prime.

It is a super-2 number, since 2×17974981² = 646199883900722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (17974921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8987490 + 8987491.

It is an arithmetic number, because the mean of its divisors is an integer number (8987491).

Almost surely, 2^17974981 is an apocalyptic number.

It is an amenable number.

17974981 is a deficient number, since it is larger than the sum of its proper divisors (1).

17974981 is an equidigital number, since it uses as much as digits as its factorization.

17974981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 127008, while the sum is 46.

The square root of 17974981 is about 4239.6911444113. The cubic root of 17974981 is about 261.9526602890.

The spelling of 17974981 in words is "seventeen million, nine hundred seventy-four thousand, nine hundred eighty-one".