1461821 has 2 divisors, whose sum is σ = 1461822. Its totient is φ = 1461820.

The previous prime is 1461809. The next prime is 1461851. The reversal of 1461821 is 1281641.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1406596 + 55225 = 1186^2 + 235^2 .

It is a cyclic number.

It is not a de Polignac number, because 1461821 - 2¹⁸ = 1199677 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1461851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 730910 + 730911.

It is an arithmetic number, because the mean of its divisors is an integer number (730911).

2^1461821 is an apocalyptic number.

It is an amenable number.

1461821 is a deficient number, since it is larger than the sum of its proper divisors (1).

1461821 is an equidigital number, since it uses as much as digits as its factorization.

1461821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 384, while the sum is 23.

The square root of 1461821 is about 1209.0578977038. The cubic root of 1461821 is about 113.4918648390.

The spelling of 1461821 in words is "one million, four hundred sixty-one thousand, eight hundred twenty-one".