642038953 has 2 divisors, whose sum is σ = 642038954. Its totient is φ = 642038952.

The previous prime is 642038909. The next prime is 642038963. The reversal of 642038953 is 359830246.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 614444944 + 27594009 = 24788^2 + 5253^2 .

It is a cyclic number.

It is not a de Polignac number, because 642038953 - 2¹³ = 642030761 is a prime.

It is not a weakly prime, because it can be changed into another prime (642038963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321019476 + 321019477.

It is an arithmetic number, because the mean of its divisors is an integer number (321019477).

Almost surely, 2^642038953 is an apocalyptic number.

It is an amenable number.

642038953 is a deficient number, since it is larger than the sum of its proper divisors (1).

642038953 is an equidigital number, since it uses as much as digits as its factorization.

642038953 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 155520, while the sum is 40.

The square root of 642038953 is about 25338.4875831215. The cubic root of 642038953 is about 862.6880706729.

The spelling of 642038953 in words is "six hundred forty-two million, thirty-eight thousand, nine hundred fifty-three".