781375978241 has 2 divisors, whose sum is σ = 781375978242. Its totient is φ = 781375978240.

The previous prime is 781375978231. The next prime is 781375978247. The reversal of 781375978241 is 142879573187.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 728469078016 + 52906900225 = 853504^2 + 230015^2 .

It is a cyclic number.

It is not a de Polignac number, because 781375978241 - 2¹⁴ = 781375961857 is a prime.

It is a super-2 number, since 2×781375978241² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (781375978247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 390687989120 + 390687989121.

It is an arithmetic number, because the mean of its divisors is an integer number (390687989121).

Almost surely, 2^781375978241 is an apocalyptic number.

It is an amenable number.

781375978241 is a deficient number, since it is larger than the sum of its proper divisors (1).

781375978241 is an equidigital number, since it uses as much as digits as its factorization.

781375978241 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23708160, while the sum is 62.

The spelling of 781375978241 in words is "seven hundred eighty-one billion, three hundred seventy-five million, nine hundred seventy-eight thousand, two hundred forty-one".