17672561 has 2 divisors, whose sum is σ = 17672562. Its totient is φ = 17672560.

The previous prime is 17672549. The next prime is 17672581. The reversal of 17672561 is 16527671.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13830961 + 3841600 = 3719^2 + 1960^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-17672561 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (17672521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8836280 + 8836281.

It is an arithmetic number, because the mean of its divisors is an integer number (8836281).

Almost surely, 2^17672561 is an apocalyptic number.

It is an amenable number.

17672561 is a deficient number, since it is larger than the sum of its proper divisors (1).

17672561 is an equidigital number, since it uses as much as digits as its factorization.

17672561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17640, while the sum is 35.

The square root of 17672561 is about 4203.8745223900. The cubic root of 17672561 is about 260.4752697495.

The spelling of 17672561 in words is "seventeen million, six hundred seventy-two thousand, five hundred sixty-one".