216090457 has 4 divisors (see below), whose sum is σ = 235735056. Its totient is φ = 196445860.

The previous prime is 216090449. The next prime is 216090461. The reversal of 216090457 is 754090612.

216090457 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 216090457 - 2³ = 216090449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216090157) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9822283 + ... + 9822304.

It is an arithmetic number, because the mean of its divisors is an integer number (58933764).

Almost surely, 2^216090457 is an apocalyptic number.

It is an amenable number.

216090457 is a deficient number, since it is larger than the sum of its proper divisors (19644599).

216090457 is a wasteful number, since it uses less digits than its factorization.

216090457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19644598.

The product of its (nonzero) digits is 15120, while the sum is 34.

The square root of 216090457 is about 14700.0155442095. The cubic root of 216090457 is about 600.0837447923.

The spelling of 216090457 in words is "two hundred sixteen million, ninety thousand, four hundred fifty-seven".