1020345545 has 4 divisors (see below), whose sum is σ = 1224414660. Its totient is φ = 816276432.

The previous prime is 1020345533. The next prime is 1020345551. The reversal of 1020345545 is 5455430201.

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 300120976 + 720224569 = 17324^2 + 26837^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1020345545 is a prime.

It is a super-2 number, since 2×1020345545² = 2082210062402694050, which contains 22 as substring.

It is a Curzon 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, 102034550 + ... + 102034559.

It is an arithmetic number, because the mean of its divisors is an integer number (306103665).

Almost surely, 2^1020345545 is an apocalyptic number.

It is an amenable number.

1020345545 is a deficient number, since it is larger than the sum of its proper divisors (204069115).

1020345545 is an equidigital number, since it uses as much as digits as its factorization.

1020345545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204069114.

The product of its (nonzero) digits is 12000, while the sum is 29.

The square root of 1020345545 is about 31942.8481040749. The cubic root of 1020345545 is about 1006.7363677866.

Adding to 1020345545 its reverse (5455430201), we get a palindrome (6475775746).

The spelling of 1020345545 in words is "one billion, twenty million, three hundred forty-five thousand, five hundred forty-five".