1961889967 has 2 divisors, whose sum is σ = 1961889968. Its totient is φ = 1961889966.

The previous prime is 1961889931. The next prime is 1961889977. The reversal of 1961889967 is 7699881691.

It is a strong prime.

It is an emirp because it is prime and its reverse (7699881691) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1961889967 - 2¹¹ = 1961887919 is a prime.

It is a super-2 number, since 2×1961889967² = 7698024485230522178, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1961889899 and 1961889908.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1961889907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 980944983 + 980944984.

It is an arithmetic number, because the mean of its divisors is an integer number (980944984).

Almost surely, 2^1961889967 is an apocalyptic number.

1961889967 is a deficient number, since it is larger than the sum of its proper divisors (1).

1961889967 is an equidigital number, since it uses as much as digits as its factorization.

1961889967 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11757312, while the sum is 64.

The square root of 1961889967 is about 44293.2271007656. The cubic root of 1961889967 is about 1251.8670694794.

The spelling of 1961889967 in words is "one billion, nine hundred sixty-one million, eight hundred eighty-nine thousand, nine hundred sixty-seven".