215201457 has 6 divisors (see below), whose sum is σ = 310846562. Its totient is φ = 143467632.

The previous prime is 215201443. The next prime is 215201513. The reversal of 215201457 is 754102512.

215201457 is a `hidden beast` number, since 2 + 1 + 5 + 201 + 457 = 666.

It can be written as a sum of positive squares in only one way, i.e., 139145616 + 76055841 = 11796^2 + 8721^2 .

It is not a de Polignac number, because 215201457 - 2¹¹ = 215199409 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 215201457.

It is not an unprimeable number, because it can be changed into a prime (215201417) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11955628 + ... + 11955645.

Almost surely, 2^215201457 is an apocalyptic number.

It is an amenable number.

215201457 is a deficient number, since it is larger than the sum of its proper divisors (95645105).

215201457 is a wasteful number, since it uses less digits than its factorization.

215201457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23911279 (or 23911276 counting only the distinct ones).

The product of its (nonzero) digits is 2800, while the sum is 27.

The square root of 215201457 is about 14669.7463168250. The cubic root of 215201457 is about 599.2596952906.

Adding to 215201457 its reverse (754102512), we get a palindrome (969303969).

The spelling of 215201457 in words is "two hundred fifteen million, two hundred one thousand, four hundred fifty-seven".