521654201 has 2 divisors, whose sum is σ = 521654202. Its totient is φ = 521654200.

The previous prime is 521654179. The next prime is 521654213. The reversal of 521654201 is 102456125.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 518928400 + 2725801 = 22780^2 + 1651^2 .

It is a cyclic number.

It is not a de Polignac number, because 521654201 - 2⁶ = 521654137 is a prime.

It is not a weakly prime, because it can be changed into another prime (521654261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260827100 + 260827101.

It is an arithmetic number, because the mean of its divisors is an integer number (260827101).

Almost surely, 2^521654201 is an apocalyptic number.

It is an amenable number.

521654201 is a deficient number, since it is larger than the sum of its proper divisors (1).

521654201 is an equidigital number, since it uses as much as digits as its factorization.

521654201 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 521654201 is about 22839.7504583566. The cubic root of 521654201 is about 804.9969527809.

The spelling of 521654201 in words is "five hundred twenty-one million, six hundred fifty-four thousand, two hundred one".