11202161261 has 4 divisors (see below), whose sum is σ = 11252395392. Its totient is φ = 11151927132.

The previous prime is 11202161251. The next prime is 11202161263. The reversal of 11202161261 is 16216120211.

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 an emirpimes, since its reverse is a distinct semiprime: 16216120211 = 29 ⋅559176559.

It is a cyclic number.

It is not a de Polignac number, because 11202161261 - 2⁶ = 11202161197 is a prime.

It is a super-2 number, since 2×11202161261² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11202161263) 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, 25116731 + ... + 25117176.

It is an arithmetic number, because the mean of its divisors is an integer number (2813098848).

Almost surely, 2^11202161261 is an apocalyptic number.

It is an amenable number.

11202161261 is a deficient number, since it is larger than the sum of its proper divisors (50234131).

11202161261 is an equidigital number, since it uses as much as digits as its factorization.

11202161261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50234130.

The product of its (nonzero) digits is 288, while the sum is 23.

Adding to 11202161261 its reverse (16216120211), we get a palindrome (27418281472).

The spelling of 11202161261 in words is "eleven billion, two hundred two million, one hundred sixty-one thousand, two hundred sixty-one".