1351861 has 12 divisors (see below), whose sum is σ = 1608768. Its totient is φ = 1132152.

The previous prime is 1351853. The next prime is 1351897. The reversal of 1351861 is 1681531.

It is not a de Polignac number, because 1351861 - 2³ = 1351853 is a prime.

1351861 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1351841) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2010 + ... + 2596.

It is an arithmetic number, because the mean of its divisors is an integer number (134064).

2^1351861 is an apocalyptic number.

It is an amenable number.

1351861 is a deficient number, since it is larger than the sum of its proper divisors (256907).

1351861 is an equidigital number, since it uses as much as digits as its factorization.

1351861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 648 (or 641 counting only the distinct ones).

The product of its digits is 720, while the sum is 25.

The square root of 1351861 is about 1162.6955749464. The cubic root of 1351861 is about 110.5717066975.

The spelling of 1351861 in words is "one million, three hundred fifty-one thousand, eight hundred sixty-one".