1961613685 has 8 divisors (see below), whose sum is σ = 2354180256. Its totient is φ = 1569128400.

The previous prime is 1961613683. The next prime is 1961613721. The reversal of 1961613685 is 5863161691.

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

It is not a de Polignac number, because 1961613685 - 2¹ = 1961613683 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 (1961613683) 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, 66510 + ... + 91360.

It is an arithmetic number, because the mean of its divisors is an integer number (294272532).

Almost surely, 2^1961613685 is an apocalyptic number.

It is an amenable number.

1961613685 is a deficient number, since it is larger than the sum of its proper divisors (392566571).

1961613685 is a wasteful number, since it uses less digits than its factorization.

1961613685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40643.

The product of its digits is 233280, while the sum is 46.

The square root of 1961613685 is about 44290.1082071381. The cubic root of 1961613685 is about 1251.8083022396.

The spelling of 1961613685 in words is "one billion, nine hundred sixty-one million, six hundred thirteen thousand, six hundred eighty-five".