365439981397 has 2 divisors, whose sum is σ = 365439981398. Its totient is φ = 365439981396.

The previous prime is 365439981299. The next prime is 365439981419. The reversal of 365439981397 is 793189934563.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 343350293521 + 22089687876 = 585961^2 + 148626^2 .

It is a cyclic number.

It is not a de Polignac number, because 365439981397 - 2³⁵ = 331080243029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (365439981197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 182719990698 + 182719990699.

It is an arithmetic number, because the mean of its divisors is an integer number (182719990699).

Almost surely, 2^365439981397 is an apocalyptic number.

It is an amenable number.

365439981397 is a deficient number, since it is larger than the sum of its proper divisors (1).

365439981397 is an equidigital number, since it uses as much as digits as its factorization.

365439981397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 132269760, while the sum is 67.

The spelling of 365439981397 in words is "three hundred sixty-five billion, four hundred thirty-nine million, nine hundred eighty-one thousand, three hundred ninety-seven".