215898001 has 6 divisors (see below), whose sum is σ = 237309506. Its totient is φ = 196270800.

The previous prime is 215897989. The next prime is 215898017. The reversal of 215898001 is 100898512.

It can be written as a sum of positive squares in only one way, i.e., 187553025 + 28344976 = 13695^2 + 5324^2 .

It is not a de Polignac number, because 215898001 - 2¹³ = 215889809 is a prime.

It is a super-2 number, since 2×215898001² = 93223893671592002, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (215898901) 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, 892020 + ... + 892261.

Almost surely, 2^215898001 is an apocalyptic number.

It is an amenable number.

215898001 is a deficient number, since it is larger than the sum of its proper divisors (21411505).

215898001 is a wasteful number, since it uses less digits than its factorization.

215898001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1784303 (or 1784292 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 34.

The square root of 215898001 is about 14693.4679704963. The cubic root of 215898001 is about 599.9055416116.

The spelling of 215898001 in words is "two hundred fifteen million, eight hundred ninety-eight thousand, one".