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642869147 is a prime number
BaseRepresentation
bin100110010100010…
…110011110011011
31122210200010200102
4212110112132123
52304033303042
6143442530015
721634204034
oct4624263633
91583603612
10642869147
112aa979118
1215b36690b
13a325835b
1461545a8b
153b689b32
hex2651679b

642869147 has 2 divisors, whose sum is σ = 642869148. Its totient is φ = 642869146.

The previous prime is 642869119. The next prime is 642869177. The reversal of 642869147 is 741968246.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 642869147 - 210 = 642868123 is a prime.

It is not a weakly prime, because it can be changed into another prime (642869177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321434573 + 321434574.

It is an arithmetic number, because the mean of its divisors is an integer number (321434574).

Almost surely, 2642869147 is an apocalyptic number.

642869147 is a deficient number, since it is larger than the sum of its proper divisors (1).

642869147 is an equidigital number, since it uses as much as digits as its factorization.

642869147 is an evil number, because the sum of its binary digits is even.

The product of its digits is 580608, while the sum is 47.

The square root of 642869147 is about 25354.8643656400. The cubic root of 642869147 is about 863.0597459338.

Subtracting 642869147 from its reverse (741968246), we obtain a palindrome (99099099).

The spelling of 642869147 in words is "six hundred forty-two million, eight hundred sixty-nine thousand, one hundred forty-seven".