642015097 has 2 divisors, whose sum is σ = 642015098. Its totient is φ = 642015096.

The previous prime is 642015061. The next prime is 642015103. The reversal of 642015097 is 790510246.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 415181376 + 226833721 = 20376^2 + 15061^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-642015097 is a prime.

It is not a weakly prime, because it can be changed into another prime (642015197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321007548 + 321007549.

It is an arithmetic number, because the mean of its divisors is an integer number (321007549).

Almost surely, 2^642015097 is an apocalyptic number.

It is an amenable number.

642015097 is a deficient number, since it is larger than the sum of its proper divisors (1).

642015097 is an equidigital number, since it uses as much as digits as its factorization.

642015097 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15120, while the sum is 34.

The square root of 642015097 is about 25338.0168324200. The cubic root of 642015097 is about 862.6773856818.

The spelling of 642015097 in words is "six hundred forty-two million, fifteen thousand, ninety-seven".