1968391137 has 8 divisors (see below), whose sum is σ = 2624846080. Its totient is φ = 1312098480.

The previous prime is 1968391123. The next prime is 1968391141. The reversal of 1968391137 is 7311938691.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1968391137 - 2¹¹ = 1968389089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1968391147) 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, 8689 + ... + 63342.

It is an arithmetic number, because the mean of its divisors is an integer number (328105760).

Almost surely, 2^1968391137 is an apocalyptic number.

It is an amenable number.

1968391137 is a deficient number, since it is larger than the sum of its proper divisors (656454943).

1968391137 is an equidigital number, since it uses as much as digits as its factorization.

1968391137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81143.

The product of its digits is 244944, while the sum is 48.

The square root of 1968391137 is about 44366.5542610647. The cubic root of 1968391137 is about 1253.2483272772.

The spelling of 1968391137 in words is "one billion, nine hundred sixty-eight million, three hundred ninety-one thousand, one hundred thirty-seven".