3581261 has 4 divisors (see below), whose sum is σ = 3736992. Its totient is φ = 3425532.

The previous prime is 3581257. The next prime is 3581269. The reversal of 3581261 is 1621853.

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 3581261 - 2² = 3581257 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 3581261.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3581269) 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, 77831 + ... + 77876.

It is an arithmetic number, because the mean of its divisors is an integer number (934248).

Almost surely, 2^3581261 is an apocalyptic number.

It is an amenable number.

3581261 is a deficient number, since it is larger than the sum of its proper divisors (155731).

3581261 is a wasteful number, since it uses less digits than its factorization.

3581261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155730.

The product of its digits is 1440, while the sum is 26.

The square root of 3581261 is about 1892.4219931083. The cubic root of 3581261 is about 152.9955001738.

The spelling of 3581261 in words is "three million, five hundred eighty-one thousand, two hundred sixty-one".