1961987383 has 8 divisors (see below), whose sum is σ = 1968021360. Its totient is φ = 1955963520.

The previous prime is 1961987369. The next prime is 1961987413. The reversal of 1961987383 is 3837891691.

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 1961987383 - 2¹⁷ = 1961856311 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1961987483) 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, 560268 + ... + 563758.

It is an arithmetic number, because the mean of its divisors is an integer number (246002670).

Almost surely, 2^1961987383 is an apocalyptic number.

1961987383 is a deficient number, since it is larger than the sum of its proper divisors (6033977).

1961987383 is a wasteful number, since it uses less digits than its factorization.

1961987383 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5057.

The product of its digits is 1959552, while the sum is 55.

The square root of 1961987383 is about 44294.3267586268. The cubic root of 1961987383 is about 1251.8877892728.

The spelling of 1961987383 in words is "one billion, nine hundred sixty-one million, nine hundred eighty-seven thousand, three hundred eighty-three".