90459139 has 2 divisors, whose sum is σ = 90459140. Its totient is φ = 90459138.

The previous prime is 90459119. The next prime is 90459151. The reversal of 90459139 is 93195409.

It is a strong prime.

It is an emirp because it is prime and its reverse (93195409) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90459139 is a prime.

It is not a weakly prime, because it can be changed into another prime (90459119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45229569 + 45229570.

It is an arithmetic number, because the mean of its divisors is an integer number (45229570).

Almost surely, 2^90459139 is an apocalyptic number.

90459139 is a deficient number, since it is larger than the sum of its proper divisors (1).

90459139 is an equidigital number, since it uses as much as digits as its factorization.

90459139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 43740, while the sum is 40.

The square root of 90459139 is about 9511.0009462727. Note that the first 3 decimals coincide. The cubic root of 90459139 is about 448.9012519219.

The spelling of 90459139 in words is "ninety million, four hundred fifty-nine thousand, one hundred thirty-nine".