2123601531 has 12 divisors (see below), whose sum is σ = 2932475832. Its totient is φ = 1366914304.

The previous prime is 2123601527. The next prime is 2123601541. The reversal of 2123601531 is 1351063212.

It is not a de Polignac number, because 2123601531 - 2² = 2123601527 is a prime.

It is a super-2 number, since 2×2123601531² = 9019366924931087922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2123601511) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 418326 + ... + 423371.

It is an arithmetic number, because the mean of its divisors is an integer number (244372986).

Almost surely, 2^2123601531 is an apocalyptic number.

2123601531 is a deficient number, since it is larger than the sum of its proper divisors (808874301).

2123601531 is an equidigital number, since it uses as much as digits as its factorization.

2123601531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 841758 (or 841729 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 2123601531 is about 46082.5512640088. The cubic root of 2123601531 is about 1285.3587053920.

Adding to 2123601531 its reverse (1351063212), we get a palindrome (3474664743).

The spelling of 2123601531 in words is "two billion, one hundred twenty-three million, six hundred one thousand, five hundred thirty-one".