13401961 has 4 divisors (see below), whose sum is σ = 13409424. Its totient is φ = 13394500.

The previous prime is 13401937. The next prime is 13401989. The reversal of 13401961 is 16910431.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 16910431 = 127 ⋅133153.

It is a cyclic number.

It is not a de Polignac number, because 13401961 - 2⁷ = 13401833 is a prime.

It is a super-2 number, since 2×13401961² = 359225117291042, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13401931) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 786 + ... + 5236.

It is an arithmetic number, because the mean of its divisors is an integer number (3352356).

Almost surely, 2^13401961 is an apocalyptic number.

It is an amenable number.

13401961 is a deficient number, since it is larger than the sum of its proper divisors (7463).

13401961 is an equidigital number, since it uses as much as digits as its factorization.

13401961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7462.

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 13401961 is about 3660.8688859340. The cubic root of 13401961 is about 237.5323597643.

The spelling of 13401961 in words is "thirteen million, four hundred one thousand, nine hundred sixty-one".