18649537 has 2 divisors, whose sum is σ = 18649538. Its totient is φ = 18649536.

The previous prime is 18649471. The next prime is 18649541. The reversal of 18649537 is 73594681.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18395521 + 254016 = 4289^2 + 504^2 .

It is a cyclic number.

It is not a de Polignac number, because 18649537 - 2¹⁵ = 18616769 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18649493 and 18649502.

It is not a weakly prime, because it can be changed into another prime (18649597) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9324768 + 9324769.

It is an arithmetic number, because the mean of its divisors is an integer number (9324769).

Almost surely, 2^18649537 is an apocalyptic number.

It is an amenable number.

18649537 is a deficient number, since it is larger than the sum of its proper divisors (1).

18649537 is an equidigital number, since it uses as much as digits as its factorization.

18649537 is an evil number, because the sum of its binary digits is even.

The product of its digits is 181440, while the sum is 43.

The square root of 18649537 is about 4318.5109702304. The cubic root of 18649537 is about 265.1893129270.

The spelling of 18649537 in words is "eighteen million, six hundred forty-nine thousand, five hundred thirty-seven".