90561643 has 2 divisors, whose sum is σ = 90561644. Its totient is φ = 90561642.

The previous prime is 90561593. The next prime is 90561763. The reversal of 90561643 is 34616509.

It is a weak prime.

It is an emirp because it is prime and its reverse (34616509) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 90561643 - 2¹³ = 90553451 is a prime.

It is a super-2 number, since 2×90561643² = 16402822365718898, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 90561599 and 90561608.

It is not a weakly prime, because it can be changed into another prime (90561343) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45280821 + 45280822.

It is an arithmetic number, because the mean of its divisors is an integer number (45280822).

Almost surely, 2^90561643 is an apocalyptic number.

90561643 is a deficient number, since it is larger than the sum of its proper divisors (1).

90561643 is an equidigital number, since it uses as much as digits as its factorization.

90561643 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19440, while the sum is 34.

The square root of 90561643 is about 9516.3881278561. The cubic root of 90561643 is about 449.0707457767.

It can be divided in two parts, 90561 and 643, that added together give a square (91204 = 302²).

The spelling of 90561643 in words is "ninety million, five hundred sixty-one thousand, six hundred forty-three".