1001253123 has 32 divisors (see below), whose sum is σ = 1599360000. Its totient is φ = 615415968.

The previous prime is 1001253119. The next prime is 1001253139. The reversal of 1001253123 is 3213521001.

1001253123 is a `hidden beast` number, since 100 + 12 + 531 + 23 = 666.

It is not a de Polignac number, because 1001253123 - 2² = 1001253119 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1001253096 and 1001253105.

It is not an unprimeable number, because it can be changed into a prime (1001253103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 499878 + ... + 501876.

It is an arithmetic number, because the mean of its divisors is an integer number (49980000).

Almost surely, 2^1001253123 is an apocalyptic number.

1001253123 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1001253123 is a deficient number, since it is larger than the sum of its proper divisors (598106877).

1001253123 is a wasteful number, since it uses less digits than its factorization.

1001253123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3448 (or 3442 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

The square root of 1001253123 is about 31642.5840126877. The cubic root of 1001253123 is about 1000.4175333083.

Adding to 1001253123 its reverse (3213521001), we get a palindrome (4214774124).

The spelling of 1001253123 in words is "one billion, one million, two hundred fifty-three thousand, one hundred twenty-three".