1021409512 has 8 divisors (see below), whose sum is σ = 1915142850. Its totient is φ = 510704752.

The previous prime is 1021409497. The next prime is 1021409513. The reversal of 1021409512 is 2159041201.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 577633156 + 443776356 = 24034^2 + 21066^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (1021409513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63838087 + ... + 63838102.

Almost surely, 2^1021409512 is an apocalyptic number.

It is an amenable number.

1021409512 is a deficient number, since it is larger than the sum of its proper divisors (893733338).

1021409512 is a wasteful number, since it uses less digits than its factorization.

1021409512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127676195 (or 127676191 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 1021409512 is about 31959.4979935543. The cubic root of 1021409512 is about 1007.0861715646.

The spelling of 1021409512 in words is "one billion, twenty-one million, four hundred nine thousand, five hundred twelve".