5121978623 has 8 divisors (see below), whose sum is σ = 5213158800. Its totient is φ = 5030944128.

The previous prime is 5121978607. The next prime is 5121978679. The reversal of 5121978623 is 3268791215.

It is a Cunningham number, because it is equal to 71568²-1.

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 5121978623 - 2⁴ = 5121978607 is a prime.

It is a super-2 number, since 2×5121978623² = 52469330028937952258, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5121978683) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35783 + ... + 107351.

It is an arithmetic number, because the mean of its divisors is an integer number (651644850).

Almost surely, 2^5121978623 is an apocalyptic number.

5121978623 is a deficient number, since it is larger than the sum of its proper divisors (91180177).

5121978623 is a wasteful number, since it uses less digits than its factorization.

5121978623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72841.

The product of its digits is 181440, while the sum is 44.

The square root of 5121978623 is about 71567.9999930136. Note that the first 5 decimals coincide. The cubic root of 5121978623 is about 1723.7697449956.

The spelling of 5121978623 in words is "five billion, one hundred twenty-one million, nine hundred seventy-eight thousand, six hundred twenty-three".