90787019 has 2 divisors, whose sum is σ = 90787020. Its totient is φ = 90787018.

The previous prime is 90787009. The next prime is 90787043. The reversal of 90787019 is 91078709.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 90787019 - 2⁸ = 90786763 is a prime.

It is a super-2 number, since 2×90787019² = 16484565637812722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (90787009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45393509 + 45393510.

It is an arithmetic number, because the mean of its divisors is an integer number (45393510).

Almost surely, 2^90787019 is an apocalyptic number.

90787019 is a deficient number, since it is larger than the sum of its proper divisors (1).

90787019 is an equidigital number, since it uses as much as digits as its factorization.

90787019 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31752, while the sum is 41.

The square root of 90787019 is about 9528.2222371227. Note that the first 4 decimals coincide. The cubic root of 90787019 is about 449.4429634266.

The spelling of 90787019 in words is "ninety million, seven hundred eighty-seven thousand, nineteen".