290281993 has 2 divisors, whose sum is σ = 290281994. Its totient is φ = 290281992.

The previous prime is 290281969. The next prime is 290282051. The reversal of 290281993 is 399182092.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 281299984 + 8982009 = 16772^2 + 2997^2 .

It is a cyclic number.

It is not a de Polignac number, because 290281993 - 2⁵ = 290281961 is a prime.

It is not a weakly prime, because it can be changed into another prime (290281193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 145140996 + 145140997.

It is an arithmetic number, because the mean of its divisors is an integer number (145140997).

Almost surely, 2^290281993 is an apocalyptic number.

It is an amenable number.

290281993 is a deficient number, since it is larger than the sum of its proper divisors (1).

290281993 is an equidigital number, since it uses as much as digits as its factorization.

290281993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 69984, while the sum is 43.

The square root of 290281993 is about 17037.6639537232. The cubic root of 290281993 is about 662.1250703047.

The spelling of 290281993 in words is "two hundred ninety million, two hundred eighty-one thousand, nine hundred ninety-three".