1961690705 has 16 divisors (see below), whose sum is σ = 2578080960. Its totient is φ = 1424077248.

The previous prime is 1961690699. The next prime is 1961690779. The reversal of 1961690705 is 5070961691.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1961690705 - 2¹⁴ = 1961674321 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 251927 + ... + 259596.

It is an arithmetic number, because the mean of its divisors is an integer number (161130060).

Almost surely, 2^1961690705 is an apocalyptic number.

It is an amenable number.

1961690705 is a deficient number, since it is larger than the sum of its proper divisors (616390255).

1961690705 is a wasteful number, since it uses less digits than its factorization.

1961690705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 511600.

The product of its (nonzero) digits is 102060, while the sum is 44.

The square root of 1961690705 is about 44290.9776929794. The cubic root of 1961690705 is about 1251.8246855221.

The spelling of 1961690705 in words is "one billion, nine hundred sixty-one million, six hundred ninety thousand, seven hundred five".