1961677749 has 8 divisors (see below), whose sum is σ = 2618235072. Its totient is φ = 1306452800.

The previous prime is 1961677741. The next prime is 1961677807. The reversal of 1961677749 is 9477761691.

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 1961677749 - 2³ = 1961677741 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1961677741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 329652 + ... + 335549.

It is an arithmetic number, because the mean of its divisors is an integer number (327279384).

Almost surely, 2^1961677749 is an apocalyptic number.

It is an amenable number.

1961677749 is a deficient number, since it is larger than the sum of its proper divisors (656557323).

1961677749 is an equidigital number, since it uses as much as digits as its factorization.

1961677749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 666187.

The product of its digits is 4000752, while the sum is 57.

The square root of 1961677749 is about 44290.8314327017. The cubic root of 1961677749 is about 1251.8219296211.

The spelling of 1961677749 in words is "one billion, nine hundred sixty-one million, six hundred seventy-seven thousand, seven hundred forty-nine".