1961971 has 4 divisors (see below), whose sum is σ = 2140344. Its totient is φ = 1783600.

The previous prime is 1961963. The next prime is 1961983. The reversal of 1961971 is 1791691.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1791691 = 11 ⋅162881.

It is a cyclic number.

It is not a de Polignac number, because 1961971 - 2³ = 1961963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1961671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 89170 + ... + 89191.

It is an arithmetic number, because the mean of its divisors is an integer number (535086).

2^1961971 is an apocalyptic number.

1961971 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1961971 is a deficient number, since it is larger than the sum of its proper divisors (178373).

1961971 is a wasteful number, since it uses less digits than its factorization.

1961971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178372.

The product of its digits is 3402, while the sum is 34.

The square root of 1961971 is about 1400.7037516906. The cubic root of 1961971 is about 125.1884304756.

The spelling of 1961971 in words is "one million, nine hundred sixty-one thousand, nine hundred seventy-one".