1971967 has 2 divisors, whose sum is σ = 1971968. Its totient is φ = 1971966.

The previous prime is 1971911. The next prime is 1972007. The reversal of 1971967 is 7691791.

It is an a-pointer prime, because the next prime (1972007) can be obtained adding 1971967 to its sum of digits (40).

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1971967 is a prime.

It is a Chen prime.

1971967 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1971467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 985983 + 985984.

It is an arithmetic number, because the mean of its divisors is an integer number (985984).

2^1971967 is an apocalyptic number.

1971967 is a deficient number, since it is larger than the sum of its proper divisors (1).

1971967 is an equidigital number, since it uses as much as digits as its factorization.

1971967 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23814, while the sum is 40.

The square root of 1971967 is about 1404.2674246738. The cubic root of 1971967 is about 125.4006769582.

The spelling of 1971967 in words is "one million, nine hundred seventy-one thousand, nine hundred sixty-seven".