642506097 has 4 divisors (see below), whose sum is σ = 856674800. Its totient is φ = 428337396.

The previous prime is 642506083. The next prime is 642506099. The reversal of 642506097 is 790605246.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 642506097 - 2¹⁴ = 642489713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (642506099) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 107084347 + ... + 107084352.

It is an arithmetic number, because the mean of its divisors is an integer number (214168700).

Almost surely, 2^642506097 is an apocalyptic number.

It is an amenable number.

642506097 is a deficient number, since it is larger than the sum of its proper divisors (214168703).

642506097 is a wasteful number, since it uses less digits than its factorization.

642506097 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214168702.

The product of its (nonzero) digits is 90720, while the sum is 39.

The square root of 642506097 is about 25347.7039788617. The cubic root of 642506097 is about 862.8972489756.

The spelling of 642506097 in words is "six hundred forty-two million, five hundred six thousand, ninety-seven".