1651943 has 2 divisors, whose sum is σ = 1651944. Its totient is φ = 1651942.

The previous prime is 1651921. The next prime is 1651961. The reversal of 1651943 is 3491561.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1651943 - 2¹² = 1647847 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 (1651343) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 825971 + 825972.

It is an arithmetic number, because the mean of its divisors is an integer number (825972).

2^1651943 is an apocalyptic number.

1651943 is a deficient number, since it is larger than the sum of its proper divisors (1).

1651943 is an equidigital number, since it uses as much as digits as its factorization.

1651943 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3240, while the sum is 29.

The square root of 1651943 is about 1285.2793470682. The cubic root of 1651943 is about 118.2129402167.

The spelling of 1651943 in words is "one million, six hundred fifty-one thousand, nine hundred forty-three".