1968131761 has 4 divisors (see below), whose sum is σ = 1972698624. Its totient is φ = 1963564900.

The previous prime is 1968131743. The next prime is 1968131771. The reversal of 1968131761 is 1671318691.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1968131761 - 2⁵ = 1968131729 is a prime.

It is a super-2 number, since 2×1968131761² = 7747085257313922242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1968131741) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2282785 + ... + 2283646.

It is an arithmetic number, because the mean of its divisors is an integer number (493174656).

Almost surely, 2^1968131761 is an apocalyptic number.

It is an amenable number.

1968131761 is a deficient number, since it is larger than the sum of its proper divisors (4566863).

1968131761 is an equidigital number, since it uses as much as digits as its factorization.

1968131761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4566862.

The product of its digits is 54432, while the sum is 43.

The square root of 1968131761 is about 44363.6310619408. The cubic root of 1968131761 is about 1253.1932777817.

The spelling of 1968131761 in words is "one billion, nine hundred sixty-eight million, one hundred thirty-one thousand, seven hundred sixty-one".