399348143261 has 2 divisors, whose sum is σ = 399348143262. Its totient is φ = 399348143260.

The previous prime is 399348143237. The next prime is 399348143291. The reversal of 399348143261 is 162341843993.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 391868488036 + 7479655225 = 625994^2 + 86485^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-399348143261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (399348143291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199674071630 + 199674071631.

It is an arithmetic number, because the mean of its divisors is an integer number (199674071631).

Almost surely, 2^399348143261 is an apocalyptic number.

It is an amenable number.

399348143261 is a deficient number, since it is larger than the sum of its proper divisors (1).

399348143261 is an equidigital number, since it uses as much as digits as its factorization.

399348143261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3359232, while the sum is 53.

The spelling of 399348143261 in words is "three hundred ninety-nine billion, three hundred forty-eight million, one hundred forty-three thousand, two hundred sixty-one".