90494137 has 2 divisors, whose sum is σ = 90494138. Its totient is φ = 90494136.

The previous prime is 90494003. The next prime is 90494189. The reversal of 90494137 is 73149409.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 58920976 + 31573161 = 7676^2 + 5619^2 .

It is an emirp because it is prime and its reverse (73149409) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 90494137 - 2¹¹ = 90492089 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 90494096 and 90494105.

It is not a weakly prime, because it can be changed into another prime (90494197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45247068 + 45247069.

It is an arithmetic number, because the mean of its divisors is an integer number (45247069).

Almost surely, 2^90494137 is an apocalyptic number.

It is an amenable number.

90494137 is a deficient number, since it is larger than the sum of its proper divisors (1).

90494137 is an equidigital number, since it uses as much as digits as its factorization.

90494137 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27216, while the sum is 37.

The square root of 90494137 is about 9512.8406377906. The cubic root of 90494137 is about 448.9591366955.

The spelling of 90494137 in words is "ninety million, four hundred ninety-four thousand, one hundred thirty-seven".