90420661 has 2 divisors, whose sum is σ = 90420662. Its totient is φ = 90420660.

The previous prime is 90420641. The next prime is 90420667. The reversal of 90420661 is 16602409.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65918161 + 24502500 = 8119^2 + 4950^2 .

It is a cyclic number.

It is not a de Polignac number, because 90420661 - 2¹⁵ = 90387893 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90420667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45210330 + 45210331.

It is an arithmetic number, because the mean of its divisors is an integer number (45210331).

Almost surely, 2^90420661 is an apocalyptic number.

It is an amenable number.

90420661 is a deficient number, since it is larger than the sum of its proper divisors (1).

90420661 is an equidigital number, since it uses as much as digits as its factorization.

90420661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 90420661 is about 9508.9779156332. The cubic root of 90420661 is about 448.8375941857.

The spelling of 90420661 in words is "ninety million, four hundred twenty thousand, six hundred sixty-one".