478731837121 has 2 divisors, whose sum is σ = 478731837122. Its totient is φ = 478731837120.

The previous prime is 478731837113. The next prime is 478731837149. The reversal of 478731837121 is 121738137874.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 428584952896 + 50146884225 = 654664^2 + 223935^2 .

It is a cyclic number.

It is not a de Polignac number, because 478731837121 - 2³ = 478731837113 is a prime.

It is a super-5 number, since 5×478731837121⁵ (a number of 60 digits) contains 55555 as substring.

It is the 691905-th Hogben number.

It is not a weakly prime, because it can be changed into another prime (478731837821) by changing a digit.

It is a nontrivial repunit in base 691904.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 239365918560 + 239365918561.

It is an arithmetic number, because the mean of its divisors is an integer number (239365918561).

Almost surely, 2^478731837121 is an apocalyptic number.

It is an amenable number.

478731837121 is a deficient number, since it is larger than the sum of its proper divisors (1).

478731837121 is an equidigital number, since it uses as much as digits as its factorization.

478731837121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1580544, while the sum is 52.

The spelling of 478731837121 in words is "four hundred seventy-eight billion, seven hundred thirty-one million, eight hundred thirty-seven thousand, one hundred twenty-one".