18901061 has 2 divisors, whose sum is σ = 18901062. Its totient is φ = 18901060.

The previous prime is 18901031. The next prime is 18901079. The reversal of 18901061 is 16010981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16240900 + 2660161 = 4030^2 + 1631^2 .

It is a cyclic number.

It is not a de Polignac number, because 18901061 - 2⁶ = 18900997 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18901061.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18901031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9450530 + 9450531.

It is an arithmetic number, because the mean of its divisors is an integer number (9450531).

Almost surely, 2^18901061 is an apocalyptic number.

It is an amenable number.

18901061 is a deficient number, since it is larger than the sum of its proper divisors (1).

18901061 is an equidigital number, since it uses as much as digits as its factorization.

18901061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 26.

The square root of 18901061 is about 4347.5350487374. The cubic root of 18901061 is about 266.3761849065.

The spelling of 18901061 in words is "eighteen million, nine hundred one thousand, sixty-one".