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79993621 is a prime number
BaseRepresentation
bin1001100010010…
…01101100010101
312120112002121201
410301021230111
5130434243441
611534312501
71660635361
oct461115425
9176462551
1079993621
1141177434
1222958731
131375a506
14a8a42a1
157051c31
hex4c49b15

79993621 has 2 divisors, whose sum is σ = 79993622. Its totient is φ = 79993620.

The previous prime is 79993607. The next prime is 79993633. The reversal of 79993621 is 12639997.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 48790225 + 31203396 = 6985^2 + 5586^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-79993621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79993601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39996810 + 39996811.

It is an arithmetic number, because the mean of its divisors is an integer number (39996811).

Almost surely, 279993621 is an apocalyptic number.

It is an amenable number.

79993621 is a deficient number, since it is larger than the sum of its proper divisors (1).

79993621 is an equidigital number, since it uses as much as digits as its factorization.

79993621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 183708, while the sum is 46.

The square root of 79993621 is about 8943.9153059496. The cubic root of 79993621 is about 430.8754850862.

The spelling of 79993621 in words is "seventy-nine million, nine hundred ninety-three thousand, six hundred twenty-one".