1961578345 has 8 divisors (see below), whose sum is σ = 2456237376. Its totient is φ = 1501033776.

The previous prime is 1961578331. The next prime is 1961578361. The reversal of 1961578345 is 5438751691.

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 1961578345 - 2⁵ = 1961578313 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 8528487 + ... + 8528716.

It is an arithmetic number, because the mean of its divisors is an integer number (307029672).

Almost surely, 2^1961578345 is an apocalyptic number.

It is an amenable number.

1961578345 is a deficient number, since it is larger than the sum of its proper divisors (494659031).

1961578345 is a wasteful number, since it uses less digits than its factorization.

1961578345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17057231.

The product of its digits is 907200, while the sum is 49.

The square root of 1961578345 is about 44289.7092449251. The cubic root of 1961578345 is about 1251.8007847603.

The spelling of 1961578345 in words is "one billion, nine hundred sixty-one million, five hundred seventy-eight thousand, three hundred forty-five".