1020345449 has 4 divisors (see below), whose sum is σ = 1027793364. Its totient is φ = 1012897536.

The previous prime is 1020345437. The next prime is 1020345497. The reversal of 1020345449 is 9445430201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9445430201 = 149 ⋅63392149.

It can be written as a sum of positive squares in 2 ways, for example, as 799079824 + 221265625 = 28268^2 + 14875^2 .

It is a cyclic number.

It is not a de Polignac number, because 1020345449 - 2⁴ = 1020345433 is a prime.

It is a super-2 number, since 2×1020345449² = 2082209670590023202, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1020345349) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3723752 + ... + 3724025.

It is an arithmetic number, because the mean of its divisors is an integer number (256948341).

Almost surely, 2^1020345449 is an apocalyptic number.

It is an amenable number.

1020345449 is a deficient number, since it is larger than the sum of its proper divisors (7447915).

1020345449 is an equidigital number, since it uses as much as digits as its factorization.

1020345449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7447914.

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

The square root of 1020345449 is about 31942.8466013911. The cubic root of 1020345449 is about 1006.7363362134.

The spelling of 1020345449 in words is "one billion, twenty million, three hundred forty-five thousand, four hundred forty-nine".