90821737 has 2 divisors, whose sum is σ = 90821738. Its totient is φ = 90821736.

The previous prime is 90821711. The next prime is 90821749. The reversal of 90821737 is 73712809.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 79370281 + 11451456 = 8909^2 + 3384^2 .

It is a cyclic number.

It is not a de Polignac number, because 90821737 - 2²³ = 82433129 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 90821696 and 90821705.

It is not a weakly prime, because it can be changed into another prime (90822737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45410868 + 45410869.

It is an arithmetic number, because the mean of its divisors is an integer number (45410869).

Almost surely, 2^90821737 is an apocalyptic number.

It is an amenable number.

90821737 is a deficient number, since it is larger than the sum of its proper divisors (1).

90821737 is an equidigital number, since it uses as much as digits as its factorization.

90821737 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21168, while the sum is 37.

The square root of 90821737 is about 9530.0439138548. The cubic root of 90821737 is about 449.5002468444.

The spelling of 90821737 in words is "ninety million, eight hundred twenty-one thousand, seven hundred thirty-seven".