906145021 has 2 divisors, whose sum is σ = 906145022. Its totient is φ = 906145020.

The previous prime is 906145003. The next prime is 906145039. The reversal of 906145021 is 120541609.

906145021 = 21285² + 21286².

It is a balanced prime because it is at equal distance from previous prime (906145003) and next prime (906145039).

It can be written as a sum of positive squares in only one way, i.e., 453093796 + 453051225 = 21286^2 + 21285^2 .

It is a cyclic number.

It is not a de Polignac number, because 906145021 - 2⁷ = 906144893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (906145001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 453072510 + 453072511.

It is an arithmetic number, because the mean of its divisors is an integer number (453072511).

Almost surely, 2^906145021 is an apocalyptic number.

906145021 is the 21286-th centered square number.

It is an amenable number.

906145021 is a deficient number, since it is larger than the sum of its proper divisors (1).

906145021 is an equidigital number, since it uses as much as digits as its factorization.

906145021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 906145021 is about 30102.2427901975. The cubic root of 906145021 is about 967.6817922075.

The spelling of 906145021 in words is "nine hundred six million, one hundred forty-five thousand, twenty-one".