1961859379 has 4 divisors (see below), whose sum is σ = 1963394560. Its totient is φ = 1960324200.

The previous prime is 1961859371. The next prime is 1961859401. The reversal of 1961859379 is 9739581691.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1961859379 - 2³ = 1961859371 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1961859371) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 765672 + ... + 768229.

It is an arithmetic number, because the mean of its divisors is an integer number (490848640).

Almost surely, 2^1961859379 is an apocalyptic number.

1961859379 is a deficient number, since it is larger than the sum of its proper divisors (1535181).

1961859379 is a wasteful number, since it uses less digits than its factorization.

1961859379 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1535180.

The product of its digits is 3674160, while the sum is 58.

The square root of 1961859379 is about 44292.8818096091. The cubic root of 1961859379 is about 1251.8605634556.

The spelling of 1961859379 in words is "one billion, nine hundred sixty-one million, eight hundred fifty-nine thousand, three hundred seventy-nine".