1961411971 has 8 divisors (see below), whose sum is σ = 2083942080. Its totient is φ = 1840811688.

The previous prime is 1961411951. The next prime is 1961411987. The reversal of 1961411971 is 1791141691.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1961411971 - 2¹⁹ = 1960887683 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1961411911) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 480361 + ... + 484426.

It is an arithmetic number, because the mean of its divisors is an integer number (260492760).

Almost surely, 2^1961411971 is an apocalyptic number.

1961411971 is a deficient number, since it is larger than the sum of its proper divisors (122530109).

1961411971 is a wasteful number, since it uses less digits than its factorization.

1961411971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 964913.

The product of its digits is 13608, while the sum is 40.

The square root of 1961411971 is about 44287.8309584021. The cubic root of 1961411971 is about 1251.7653926838.

The spelling of 1961411971 in words is "one billion, nine hundred sixty-one million, four hundred eleven thousand, nine hundred seventy-one".