90612661 has 2 divisors, whose sum is σ = 90612662. Its totient is φ = 90612660.

The previous prime is 90612623. The next prime is 90612713. The reversal of 90612661 is 16621609.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60746436 + 29866225 = 7794^2 + 5465^2 .

It is an emirp because it is prime and its reverse (16621609) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 90612661 - 2¹³ = 90604469 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90612061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45306330 + 45306331.

It is an arithmetic number, because the mean of its divisors is an integer number (45306331).

Almost surely, 2^90612661 is an apocalyptic number.

It is an amenable number.

90612661 is a deficient number, since it is larger than the sum of its proper divisors (1).

90612661 is an equidigital number, since it uses as much as digits as its factorization.

90612661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 90612661 is about 9519.0682842387. The cubic root of 90612661 is about 449.1550581104.

The spelling of 90612661 in words is "ninety million, six hundred twelve thousand, six hundred sixty-one".