18725137 has 2 divisors, whose sum is σ = 18725138. Its totient is φ = 18725136.

The previous prime is 18725131. The next prime is 18725141. The reversal of 18725137 is 73152781.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15752961 + 2972176 = 3969^2 + 1724^2 .

It is a cyclic number.

It is not a de Polignac number, because 18725137 - 2¹⁹ = 18200849 is a prime.

It is not a weakly prime, because it can be changed into another prime (18725131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9362568 + 9362569.

It is an arithmetic number, because the mean of its divisors is an integer number (9362569).

Almost surely, 2^18725137 is an apocalyptic number.

It is an amenable number.

18725137 is a deficient number, since it is larger than the sum of its proper divisors (1).

18725137 is an equidigital number, since it uses as much as digits as its factorization.

18725137 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11760, while the sum is 34.

The square root of 18725137 is about 4327.2551346090. The cubic root of 18725137 is about 265.5471642206.

The spelling of 18725137 in words is "eighteen million, seven hundred twenty-five thousand, one hundred thirty-seven".