19722497 has 4 divisors (see below), whose sum is σ = 19848276. Its totient is φ = 19596720.

The previous prime is 19722491. The next prime is 19722503. The reversal of 19722497 is 79422791.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (19722491) and next prime (19722503).

It can be written as a sum of positive squares in 2 ways, for example, as 5764801 + 13957696 = 2401^2 + 3736^2 .

It is a cyclic number.

It is not a de Polignac number, because 19722497 - 2⁶ = 19722433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19722491) 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, 62654 + ... + 62967.

It is an arithmetic number, because the mean of its divisors is an integer number (4962069).

Almost surely, 2^19722497 is an apocalyptic number.

It is an amenable number.

19722497 is a deficient number, since it is larger than the sum of its proper divisors (125779).

19722497 is a wasteful number, since it uses less digits than its factorization.

19722497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125778.

The product of its digits is 63504, while the sum is 41.

The square root of 19722497 is about 4441.0018013957. The cubic root of 19722497 is about 270.1804783286.

The spelling of 19722497 in words is "nineteen million, seven hundred twenty-two thousand, four hundred ninety-seven".