2131261 has 4 divisors (see below), whose sum is σ = 2325024. Its totient is φ = 1937500.

The previous prime is 2131253. The next prime is 2131267. The reversal of 2131261 is 1621312.

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.

It is a cyclic number.

It is not a de Polignac number, because 2131261 - 2³ = 2131253 is a prime.

It is a Duffinian number.

2131261 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2131267) 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, 96865 + ... + 96886.

It is an arithmetic number, because the mean of its divisors is an integer number (581256).

2^2131261 is an apocalyptic number.

It is an amenable number.

2131261 is a deficient number, since it is larger than the sum of its proper divisors (193763).

2131261 is a wasteful number, since it uses less digits than its factorization.

2131261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193762.

The product of its digits is 72, while the sum is 16.

The square root of 2131261 is about 1459.8838994934. The cubic root of 2131261 is about 128.6902207796.

Adding to 2131261 its reverse (1621312), we get a palindrome (3752573).

The spelling of 2131261 in words is "two million, one hundred thirty-one thousand, two hundred sixty-one".