642472247 has 2 divisors, whose sum is σ = 642472248. Its totient is φ = 642472246.

The previous prime is 642472223. The next prime is 642472261. The reversal of 642472247 is 742274246.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 642472247 - 2⁶ = 642472183 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 642472247.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (642472217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321236123 + 321236124.

It is an arithmetic number, because the mean of its divisors is an integer number (321236124).

Almost surely, 2^642472247 is an apocalyptic number.

642472247 is a deficient number, since it is larger than the sum of its proper divisors (1).

642472247 is an equidigital number, since it uses as much as digits as its factorization.

642472247 is an evil number, because the sum of its binary digits is even.

The product of its digits is 150528, while the sum is 38.

The square root of 642472247 is about 25347.0362567303. The cubic root of 642472247 is about 862.8820949898.

The spelling of 642472247 in words is "six hundred forty-two million, four hundred seventy-two thousand, two hundred forty-seven".