1961677693 has 8 divisors (see below), whose sum is σ = 1998472896. Its totient is φ = 1925196000.

The previous prime is 1961677639. The next prime is 1961677721. The reversal of 1961677693 is 3967761691.

It is a happy number.

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 1961677693 - 2¹⁷ = 1961546621 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 (1961677633) 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, 65728 + ... + 90793.

It is an arithmetic number, because the mean of its divisors is an integer number (249809112).

Almost surely, 2^1961677693 is an apocalyptic number.

It is an amenable number.

1961677693 is a deficient number, since it is larger than the sum of its proper divisors (36795203).

1961677693 is a wasteful number, since it uses less digits than its factorization.

1961677693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156755.

The product of its digits is 2571912, while the sum is 55.

The square root of 1961677693 is about 44290.8308005167. The cubic root of 1961677693 is about 1251.8219177092.

The spelling of 1961677693 in words is "one billion, nine hundred sixty-one million, six hundred seventy-seven thousand, six hundred ninety-three".