13400535961 has 2 divisors, whose sum is σ = 13400535962. Its totient is φ = 13400535960.

The previous prime is 13400535959. The next prime is 13400535983. The reversal of 13400535961 is 16953500431.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7453041561 + 5947494400 = 86331^2 + 77120^2 .

It is a cyclic number.

It is not a de Polignac number, because 13400535961 - 2¹ = 13400535959 is a prime.

Together with 13400535959, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 13400535961.

It is not a weakly prime, because it can be changed into another prime (13400535901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6700267980 + 6700267981.

It is an arithmetic number, because the mean of its divisors is an integer number (6700267981).

Almost surely, 2^13400535961 is an apocalyptic number.

It is an amenable number.

13400535961 is a deficient number, since it is larger than the sum of its proper divisors (1).

13400535961 is an equidigital number, since it uses as much as digits as its factorization.

13400535961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48600, while the sum is 37.

The spelling of 13400535961 in words is "thirteen billion, four hundred million, five hundred thirty-five thousand, nine hundred sixty-one".