90147779 has 2 divisors, whose sum is σ = 90147780. Its totient is φ = 90147778.

The previous prime is 90147751. The next prime is 90147793. The reversal of 90147779 is 97774109.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 90147779 - 2⁸ = 90147523 is a prime.

It is not a weakly prime, because it can be changed into another prime (90147749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45073889 + 45073890.

It is an arithmetic number, because the mean of its divisors is an integer number (45073890).

Almost surely, 2^90147779 is an apocalyptic number.

90147779 is a deficient number, since it is larger than the sum of its proper divisors (1).

90147779 is an equidigital number, since it uses as much as digits as its factorization.

90147779 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 111132, while the sum is 44.

The square root of 90147779 is about 9494.6184230858. The cubic root of 90147779 is about 448.3856210887.

The spelling of 90147779 in words is "ninety million, one hundred forty-seven thousand, seven hundred seventy-nine".