119721681 has 12 divisors (see below), whose sum is σ = 177149700. Its totient is φ = 77867520.

The previous prime is 119721671. The next prime is 119721703. The reversal of 119721681 is 186127911.

It can be written as a sum of positive squares in 2 ways, for example, as 7700625 + 112021056 = 2775^2 + 10584^2 .

It is not a de Polignac number, because 119721681 - 2⁶ = 119721617 is a prime.

It is a super-2 number, since 2×119721681² = 28666561802931522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (119721631) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 161856 + ... + 162593.

It is an arithmetic number, because the mean of its divisors is an integer number (14762475).

Almost surely, 2^119721681 is an apocalyptic number.

It is an amenable number.

119721681 is a deficient number, since it is larger than the sum of its proper divisors (57428019).

119721681 is a wasteful number, since it uses less digits than its factorization.

119721681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 324496 (or 324493 counting only the distinct ones).

The product of its digits is 6048, while the sum is 36.

The square root of 119721681 is about 10941.7403094755. The cubic root of 119721681 is about 492.8607898551.

The spelling of 119721681 in words is "one hundred nineteen million, seven hundred twenty-one thousand, six hundred eighty-one".