1642961 has 4 divisors (see below), whose sum is σ = 1649472. Its totient is φ = 1636452.

The previous prime is 1642951. The next prime is 1642997. The reversal of 1642961 is 1692461.

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 1642961 - 2¹⁸ = 1380817 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1642951) 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, 2861 + ... + 3386.

It is an arithmetic number, because the mean of its divisors is an integer number (412368).

2^1642961 is an apocalyptic number.

It is an amenable number.

1642961 is a deficient number, since it is larger than the sum of its proper divisors (6511).

1642961 is an equidigital number, since it uses as much as digits as its factorization.

1642961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6510.

The product of its digits is 2592, while the sum is 29.

The square root of 1642961 is about 1281.7804024091. The cubic root of 1642961 is about 117.9983002724.

It can be divided in two parts, 164 and 2961, that added together give a 5-th power (3125 = 5⁵).

The spelling of 1642961 in words is "one million, six hundred forty-two thousand, nine hundred sixty-one".