90789137 has 2 divisors, whose sum is σ = 90789138. Its totient is φ = 90789136.

The previous prime is 90789113. The next prime is 90789143. The reversal of 90789137 is 73198709.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 72607441 + 18181696 = 8521^2 + 4264^2 .

It is an emirp because it is prime and its reverse (73198709) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 90789137 - 2¹⁸ = 90526993 is a prime.

It is not a weakly prime, because it can be changed into another prime (90789037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45394568 + 45394569.

It is an arithmetic number, because the mean of its divisors is an integer number (45394569).

Almost surely, 2^90789137 is an apocalyptic number.

It is an amenable number.

90789137 is a deficient number, since it is larger than the sum of its proper divisors (1).

90789137 is an equidigital number, since it uses as much as digits as its factorization.

90789137 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 95256, while the sum is 44.

The square root of 90789137 is about 9528.3333799778. Note that the first 4 decimals coincide. The cubic root of 90789137 is about 449.4464584667.

The spelling of 90789137 in words is "ninety million, seven hundred eighty-nine thousand, one hundred thirty-seven".