19492981 has 2 divisors, whose sum is σ = 19492982. Its totient is φ = 19492980.

The previous prime is 19492973. The next prime is 19492987. The reversal of 19492981 is 18929491.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11792356 + 7700625 = 3434^2 + 2775^2 .

It is a cyclic number.

It is not a de Polignac number, because 19492981 - 2³ = 19492973 is a prime.

It is a super-2 number, since 2×19492981² = 759952616532722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19492987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9746490 + 9746491.

It is an arithmetic number, because the mean of its divisors is an integer number (9746491).

Almost surely, 2^19492981 is an apocalyptic number.

It is an amenable number.

19492981 is a deficient number, since it is larger than the sum of its proper divisors (1).

19492981 is an equidigital number, since it uses as much as digits as its factorization.

19492981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46656, while the sum is 43.

The square root of 19492981 is about 4415.0856163839. The cubic root of 19492981 is about 269.1283320541.

It can be divided in two parts, 19 and 492981, that multiplied together give a palindrome (9366639).

The spelling of 19492981 in words is "nineteen million, four hundred ninety-two thousand, nine hundred eighty-one".