13401161261 has 4 divisors (see below), whose sum is σ = 13863270300. Its totient is φ = 12939052224.

The previous prime is 13401161227. The next prime is 13401161269. The reversal of 13401161261 is 16216110431.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16216110431 = 4283 ⋅3786157.

It can be written as a sum of positive squares in 2 ways, for example, as 11434238761 + 1966922500 = 106931^2 + 44350^2 .

It is a cyclic number.

It is not a de Polignac number, because 13401161261 - 2¹⁴ = 13401144877 is a prime.

It is a super-2 number, since 2×13401161261² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13401161261.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13401161269) 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, 231054476 + ... + 231054533.

It is an arithmetic number, because the mean of its divisors is an integer number (3465817575).

Almost surely, 2^13401161261 is an apocalyptic number.

It is an amenable number.

13401161261 is a deficient number, since it is larger than the sum of its proper divisors (462109039).

13401161261 is an equidigital number, since it uses as much as digits as its factorization.

13401161261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 462109038.

The product of its (nonzero) digits is 864, while the sum is 26.

Adding to 13401161261 its reverse (16216110431), we get a palindrome (29617271692).

The spelling of 13401161261 in words is "thirteen billion, four hundred one million, one hundred sixty-one thousand, two hundred sixty-one".