642617453 has 2 divisors, whose sum is σ = 642617454. Its totient is φ = 642617452.

The previous prime is 642617431. The next prime is 642617461. The reversal of 642617453 is 354716246.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 332223529 + 310393924 = 18227^2 + 17618^2 .

It is a cyclic number.

It is not a de Polignac number, because 642617453 - 2²⁶ = 575508589 is a prime.

It is equal to p_33429638 and since 642617453 and 33429638 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (642617473) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321308726 + 321308727.

It is an arithmetic number, because the mean of its divisors is an integer number (321308727).

Almost surely, 2^642617453 is an apocalyptic number.

It is an amenable number.

642617453 is a deficient number, since it is larger than the sum of its proper divisors (1).

642617453 is an equidigital number, since it uses as much as digits as its factorization.

642617453 is an evil number, because the sum of its binary digits is even.

The product of its digits is 120960, while the sum is 38.

The square root of 642617453 is about 25349.9004534535. The cubic root of 642617453 is about 862.9470971332.

The spelling of 642617453 in words is "six hundred forty-two million, six hundred seventeen thousand, four hundred fifty-three".