3545025021 has 10 divisors (see below), whose sum is σ = 5295654782. Its totient is φ = 2363349960.

The previous prime is 3545025017. The next prime is 3545025059. The reversal of 3545025021 is 1205205453.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 2388276900 + 1156748121 = 48870^2 + 34011^2 .

It is not a de Polignac number, because 3545025021 - 2² = 3545025017 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3545025721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 21882790 + ... + 21882951.

Almost surely, 2^3545025021 is an apocalyptic number.

It is an amenable number.

3545025021 is a deficient number, since it is larger than the sum of its proper divisors (1750629761).

3545025021 is an equidigital number, since it uses as much as digits as its factorization.

3545025021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43765753 (or 43765744 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 27.

The square root of 3545025021 is about 59540.1127056374. The cubic root of 3545025021 is about 1524.7773600982. Note that the first 3 decimals are identical.

The spelling of 3545025021 in words is "three billion, five hundred forty-five million, twenty-five thousand, twenty-one".