1961671 has 2 divisors, whose sum is σ = 1961672. Its totient is φ = 1961670.

The previous prime is 1961669. The next prime is 1961683. The reversal of 1961671 is 1761691.

It is a weak prime.

It is an emirp because it is prime and its reverse (1761691) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1961671 - 2¹ = 1961669 is a prime.

It is a super-2 number, since 2×1961671² = 7696306224482, which contains 22 as substring.

Together with 1961669, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1961651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 980835 + 980836.

It is an arithmetic number, because the mean of its divisors is an integer number (980836).

2^1961671 is an apocalyptic number.

1961671 is a deficient number, since it is larger than the sum of its proper divisors (1).

1961671 is an equidigital number, since it uses as much as digits as its factorization.

1961671 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2268, while the sum is 31.

The square root of 1961671 is about 1400.5966585709. The cubic root of 1961671 is about 125.1820494021.

The spelling of 1961671 in words is "one million, nine hundred sixty-one thousand, six hundred seventy-one".