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83780621 is a prime number
BaseRepresentation
bin1001111111001…
…10010000001101
312211122111101222
410333212100031
5132421434441
612151413125
72035060241
oct477462015
9184574358
1083780621
1143323691
12240841a5
1314485142
14b1ac421
15754dd4b
hex4fe640d

83780621 has 2 divisors, whose sum is σ = 83780622. Its totient is φ = 83780620.

The previous prime is 83780581. The next prime is 83780663. The reversal of 83780621 is 12608738.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50268100 + 33512521 = 7090^2 + 5789^2 .

It is a cyclic number.

It is not a de Polignac number, because 83780621 - 222 = 79586317 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (83780821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41890310 + 41890311.

It is an arithmetic number, because the mean of its divisors is an integer number (41890311).

Almost surely, 283780621 is an apocalyptic number.

It is an amenable number.

83780621 is a deficient number, since it is larger than the sum of its proper divisors (1).

83780621 is an equidigital number, since it uses as much as digits as its factorization.

83780621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 83780621 is about 9153.1754599155. The cubic root of 83780621 is about 437.5703218662.

The spelling of 83780621 in words is "eighty-three million, seven hundred eighty thousand, six hundred twenty-one".