19312938841 has 9 divisors (see below), whose sum is σ = 22467203391. Its totient is φ = 16553113752.

The previous prime is 19312938823. The next prime is 19312938863. The reversal of 19312938841 is 14883921391.

It is a happy number.

The square root of 19312938841 is 138971.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 3132081225 + 16180857616 = 55965^2 + 127204^2 .

It is not a de Polignac number, because 19312938841 - 2¹⁵ = 19312906073 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19312938941) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 962871 + ... + 982723.

Almost surely, 2^19312938841 is an apocalyptic number.

19312938841 is the 138971-st square number.

19312938841 is the 69486-th centered octagonal number.

It is an amenable number.

19312938841 is a deficient number, since it is larger than the sum of its proper divisors (3154264550).

19312938841 is an frugal number, since it uses more digits than its factorization.

19312938841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39720 (or 19860 counting only the distinct ones).

The product of its digits is 373248, while the sum is 49.

Multiplying 19312938841 by its sum of digits (49), we get a square (946334003209 = 972797²).

19312938841 divided by its sum of digits (49) gives a square (394141609 = 19853²).

The spelling of 19312938841 in words is "nineteen billion, three hundred twelve million, nine hundred thirty-eight thousand, eight hundred forty-one".