1642560197 has 2 divisors, whose sum is σ = 1642560198. Its totient is φ = 1642560196.

The previous prime is 1642560169. The next prime is 1642560223. The reversal of 1642560197 is 7910652461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1583562436 + 58997761 = 39794^2 + 7681^2 .

It is a cyclic number.

It is not a de Polignac number, because 1642560197 - 2⁶ = 1642560133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1642560167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 821280098 + 821280099.

It is an arithmetic number, because the mean of its divisors is an integer number (821280099).

Almost surely, 2^1642560197 is an apocalyptic number.

It is an amenable number.

1642560197 is a deficient number, since it is larger than the sum of its proper divisors (1).

1642560197 is an equidigital number, since it uses as much as digits as its factorization.

1642560197 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 90720, while the sum is 41.

The square root of 1642560197 is about 40528.5109151570. The cubic root of 1642560197 is about 1179.8870419977.

The spelling of 1642560197 in words is "one billion, six hundred forty-two million, five hundred sixty thousand, one hundred ninety-seven".