1641261 has 4 divisors (see below), whose sum is σ = 2188352. Its totient is φ = 1094172.

The previous prime is 1641253. The next prime is 1641281. The reversal of 1641261 is 1621461.

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 not a de Polignac number, because 1641261 - 2³ = 1641253 is a prime.

It is a D-number.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1641281) 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, 273541 + ... + 273546.

It is an arithmetic number, because the mean of its divisors is an integer number (547088).

2^1641261 is an apocalyptic number.

It is an amenable number.

1641261 is a deficient number, since it is larger than the sum of its proper divisors (547091).

1641261 is an equidigital number, since it uses as much as digits as its factorization.

1641261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 547090.

The product of its digits is 288, while the sum is 21.

The square root of 1641261 is about 1281.1170906674. The cubic root of 1641261 is about 117.9575879371.

The spelling of 1641261 in words is "one million, six hundred forty-one thousand, two hundred sixty-one".