1971451 has 2 divisors, whose sum is σ = 1971452. Its totient is φ = 1971450.

The previous prime is 1971443. The next prime is 1971467. The reversal of 1971451 is 1541791.

It is a weak prime.

It is an emirp because it is prime and its reverse (1541791) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1971451 - 2³ = 1971443 is a prime.

It is not a weakly prime, because it can be changed into another prime (1971401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 985725 + 985726.

It is an arithmetic number, because the mean of its divisors is an integer number (985726).

2^1971451 is an apocalyptic number.

1971451 is a deficient number, since it is larger than the sum of its proper divisors (1).

1971451 is an equidigital number, since it uses as much as digits as its factorization.

1971451 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1260, while the sum is 28.

The square root of 1971451 is about 1404.0836869646. The cubic root of 1971451 is about 125.3897382366.

The spelling of 1971451 in words is "one million, nine hundred seventy-one thousand, four hundred fifty-one".