4290391007561 has 2 divisors, whose sum is σ = 4290391007562. Its totient is φ = 4290391007560.

The previous prime is 4290391007503. The next prime is 4290391007597. The reversal of 4290391007561 is 1657001930924.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2154014134336 + 2136376873225 = 1467656^2 + 1461635^2 .

It is a cyclic number.

It is not a de Polignac number, because 4290391007561 - 2¹⁴ = 4290390991177 is a prime.

It is not a weakly prime, because it can be changed into another prime (4290391007261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2145195503780 + 2145195503781.

It is an arithmetic number, because the mean of its divisors is an integer number (2145195503781).

Almost surely, 2^{4290391007561} is an apocalyptic number.

It is an amenable number.

4290391007561 is a deficient number, since it is larger than the sum of its proper divisors (1).

4290391007561 is an equidigital number, since it uses as much as digits as its factorization.

4290391007561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 408240, while the sum is 47.

The spelling of 4290391007561 in words is "four trillion, two hundred ninety billion, three hundred ninety-one million, seven thousand, five hundred sixty-one".