83611261 has 4 divisors (see below), whose sum is σ = 85390272. Its totient is φ = 81832252.

The previous prime is 83611249. The next prime is 83611273. The reversal of 83611261 is 16211638.

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 an interprime number because it is at equal distance from previous prime (83611249) and next prime (83611273).

It is a cyclic number.

It is not a de Polignac number, because 83611261 - 2⁹ = 83610749 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83611861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 889435 + ... + 889528.

It is an arithmetic number, because the mean of its divisors is an integer number (21347568).

Almost surely, 2^83611261 is an apocalyptic number.

It is an amenable number.

83611261 is a deficient number, since it is larger than the sum of its proper divisors (1779011).

83611261 is a wasteful number, since it uses less digits than its factorization.

83611261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1779010.

The product of its digits is 1728, while the sum is 28.

The square root of 83611261 is about 9143.9193456635. The cubic root of 83611261 is about 437.2752778973.

Adding to 83611261 its reverse (16211638), we get a palindrome (99822899).

The spelling of 83611261 in words is "eighty-three million, six hundred eleven thousand, two hundred sixty-one".