1439621378197 has 2 divisors, whose sum is σ = 1439621378198. Its totient is φ = 1439621378196.

The previous prime is 1439621378191. The next prime is 1439621378201. The reversal of 1439621378197 is 7918731269341.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 871694853316 + 567926524881 = 933646^2 + 753609^2 .

It is a cyclic number.

It is not a de Polignac number, because 1439621378197 - 2²³ = 1439612989589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1439621378191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 719810689098 + 719810689099.

It is an arithmetic number, because the mean of its divisors is an integer number (719810689099).

Almost surely, 2^{1439621378197} is an apocalyptic number.

It is an amenable number.

1439621378197 is a deficient number, since it is larger than the sum of its proper divisors (1).

1439621378197 is an equidigital number, since it uses as much as digits as its factorization.

1439621378197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13716864, while the sum is 61.

The spelling of 1439621378197 in words is "one trillion, four hundred thirty-nine billion, six hundred twenty-one million, three hundred seventy-eight thousand, one hundred ninety-seven".