215416251 has 6 divisors (see below), whose sum is σ = 311156820. Its totient is φ = 143610828.

The previous prime is 215416217. The next prime is 215416259. The reversal of 215416251 is 152614512.

It is not a de Polignac number, because 215416251 - 2¹⁰ = 215415227 is a prime.

It is a super-2 number, since 2×215416251² = 92808322389790002, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (215416259) 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, 11967561 + ... + 11967578.

It is an arithmetic number, because the mean of its divisors is an integer number (51859470).

Almost surely, 2^215416251 is an apocalyptic number.

215416251 is a deficient number, since it is larger than the sum of its proper divisors (95740569).

215416251 is a wasteful number, since it uses less digits than its factorization.

215416251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23935145 (or 23935142 counting only the distinct ones).

The product of its digits is 2400, while the sum is 27.

The square root of 215416251 is about 14677.0654764500. The cubic root of 215416251 is about 599.4590040189.

The spelling of 215416251 in words is "two hundred fifteen million, four hundred sixteen thousand, two hundred fifty-one".