1961815712 has 12 divisors (see below), whose sum is σ = 3862324746. Its totient is φ = 980907840.

The previous prime is 1961815711. The next prime is 1961815717. The reversal of 1961815712 is 2175181691.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1908291856 + 53523856 = 43684^2 + 7316^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1961815712.

It is not an unprimeable number, because it can be changed into a prime (1961815711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30653339 + ... + 30653402.

Almost surely, 2^1961815712 is an apocalyptic number.

It is an amenable number.

1961815712 is a deficient number, since it is larger than the sum of its proper divisors (1900509034).

1961815712 is an equidigital number, since it uses as much as digits as its factorization.

1961815712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61306751 (or 61306743 counting only the distinct ones).

The product of its digits is 30240, while the sum is 41.

The square root of 1961815712 is about 44292.3888721302. The cubic root of 1961815712 is about 1251.8512754299.

The spelling of 1961815712 in words is "one billion, nine hundred sixty-one million, eight hundred fifteen thousand, seven hundred twelve".