1961375785 has 8 divisors (see below), whose sum is σ = 2362028616. Its totient is φ = 1563515520.

The previous prime is 1961375777. The next prime is 1961375803. The reversal of 1961375785 is 5875731691.

It can be written as a sum of positive squares in 4 ways, for example, as 94012416 + 1867363369 = 9696^2 + 43213^2 .

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

It is not a de Polignac number, because 1961375785 - 2³ = 1961375777 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 696594 + ... + 699403.

It is an arithmetic number, because the mean of its divisors is an integer number (295253577).

Almost surely, 2^1961375785 is an apocalyptic number.

It is an amenable number.

1961375785 is a deficient number, since it is larger than the sum of its proper divisors (400652831).

1961375785 is a wasteful number, since it uses less digits than its factorization.

1961375785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1396283.

The product of its digits is 1587600, while the sum is 52.

The square root of 1961375785 is about 44287.4224244311. The cubic root of 1961375785 is about 1251.7576947156.

The spelling of 1961375785 in words is "one billion, nine hundred sixty-one million, three hundred seventy-five thousand, seven hundred eighty-five".