19122981 has 8 divisors (see below), whose sum is σ = 25556640. Its totient is φ = 12718992.

The previous prime is 19122979. The next prime is 19122989. The reversal of 19122981 is 18922191.

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

It is not a de Polignac number, because 19122981 - 2¹ = 19122979 is a prime.

It is a super-2 number, since 2×19122981² = 731376804652722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19122989) 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, 5866 + ... + 8523.

It is an arithmetic number, because the mean of its divisors is an integer number (3194580).

Almost surely, 2^19122981 is an apocalyptic number.

It is an amenable number.

19122981 is a deficient number, since it is larger than the sum of its proper divisors (6433659).

19122981 is a wasteful number, since it uses less digits than its factorization.

19122981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14835.

The product of its digits is 2592, while the sum is 33.

The square root of 19122981 is about 4372.9830779458. The cubic root of 19122981 is about 267.4146512004.

The spelling of 19122981 in words is "nineteen million, one hundred twenty-two thousand, nine hundred eighty-one".