215450001 has 48 divisors (see below), whose sum is σ = 347487504. Its totient is φ = 127775232.

The previous prime is 215449999. The next prime is 215450003. The reversal of 215450001 is 100054512.

215450001 is a `hidden beast` number, since 215 + 450 + 0 + 0 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (215449999) and next prime (215450003).

It can be written as a sum of positive squares in 8 ways, for example, as 25010001 + 190440000 = 5001^2 + 13800^2 .

It is not a de Polignac number, because 215450001 - 2¹ = 215449999 is a prime.

It is not an unprimeable number, because it can be changed into a prime (215450003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 679495 + ... + 679811.

It is an arithmetic number, because the mean of its divisors is an integer number (7239323).

Almost surely, 2^215450001 is an apocalyptic number.

It is an amenable number.

215450001 is a deficient number, since it is larger than the sum of its proper divisors (132037503).

215450001 is a wasteful number, since it uses less digits than its factorization.

215450001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 530 (or 527 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 18.

The square root of 215450001 is about 14678.2151844153. The cubic root of 215450001 is about 599.4903088141.

The spelling of 215450001 in words is "two hundred fifteen million, four hundred fifty thousand, one".