1021463645 has 4 divisors (see below), whose sum is σ = 1225756380. Its totient is φ = 817170912.

The previous prime is 1021463633. The next prime is 1021463713. The reversal of 1021463645 is 5463641201.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 446519161 + 574944484 = 21131^2 + 23978^2 .

It is a cyclic number.

It is not a de Polignac number, because 1021463645 - 2⁴ = 1021463629 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 102146360 + ... + 102146369.

It is an arithmetic number, because the mean of its divisors is an integer number (306439095).

Almost surely, 2^1021463645 is an apocalyptic number.

It is an amenable number.

1021463645 is a deficient number, since it is larger than the sum of its proper divisors (204292735).

1021463645 is an equidigital number, since it uses as much as digits as its factorization.

1021463645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204292734.

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 1021463645 is about 31960.3448823695. The cubic root of 1021463645 is about 1007.1039625459.

The spelling of 1021463645 in words is "one billion, twenty-one million, four hundred sixty-three thousand, six hundred forty-five".