1020123505 has 8 divisors (see below), whose sum is σ = 1296157032. Its totient is φ = 768092928.

The previous prime is 1020123491. The next prime is 1020123523. The reversal of 1020123505 is 5053210201.

It can be written as a sum of positive squares in 4 ways, for example, as 57138481 + 962985024 = 7559^2 + 31032^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1020123505 - 2⁵ = 1020123473 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6000642 + ... + 6000811.

It is an arithmetic number, because the mean of its divisors is an integer number (162019629).

Almost surely, 2^1020123505 is an apocalyptic number.

It is an amenable number.

1020123505 is a deficient number, since it is larger than the sum of its proper divisors (276033527).

1020123505 is a wasteful number, since it uses less digits than its factorization.

1020123505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12001475.

The product of its (nonzero) digits is 300, while the sum is 19.

The square root of 1020123505 is about 31939.3723325929. The cubic root of 1020123505 is about 1006.6633363314.

Adding to 1020123505 its reverse (5053210201), we get a palindrome (6073333706).

The spelling of 1020123505 in words is "one billion, twenty million, one hundred twenty-three thousand, five hundred five".