1642244497 has 2 divisors, whose sum is σ = 1642244498. Its totient is φ = 1642244496.

The previous prime is 1642244491. The next prime is 1642244507. The reversal of 1642244497 is 7944422461.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 984014161 + 658230336 = 31369^2 + 25656^2 .

It is a cyclic number.

It is not a de Polignac number, because 1642244497 - 2⁷ = 1642244369 is a prime.

It is not a weakly prime, because it can be changed into another prime (1642244491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 821122248 + 821122249.

It is an arithmetic number, because the mean of its divisors is an integer number (821122249).

Almost surely, 2^1642244497 is an apocalyptic number.

It is an amenable number.

1642244497 is a deficient number, since it is larger than the sum of its proper divisors (1).

1642244497 is an equidigital number, since it uses as much as digits as its factorization.

1642244497 is an evil number, because the sum of its binary digits is even.

The product of its digits is 387072, while the sum is 43.

The square root of 1642244497 is about 40524.6159389574. The cubic root of 1642244497 is about 1179.8114457412.

The spelling of 1642244497 in words is "one billion, six hundred forty-two million, two hundred forty-four thousand, four hundred ninety-seven".