215412431 has 4 divisors (see below), whose sum is σ = 231982632. Its totient is φ = 198842232.

The previous prime is 215412427. The next prime is 215412479. The reversal of 215412431 is 134214512.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 215412431 - 2² = 215412427 is a prime.

It is a super-2 number, since 2×215412431² = 92805030858659522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 215412397 and 215412406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215412031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8285081 + ... + 8285106.

It is an arithmetic number, because the mean of its divisors is an integer number (57995658).

Almost surely, 2^215412431 is an apocalyptic number.

215412431 is a deficient number, since it is larger than the sum of its proper divisors (16570201).

215412431 is a wasteful number, since it uses less digits than its factorization.

215412431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16570200.

The product of its digits is 960, while the sum is 23.

The square root of 215412431 is about 14676.9353408673. The cubic root of 215412431 is about 599.4554605738.

Adding to 215412431 its reverse (134214512), we get a palindrome (349626943).

The spelling of 215412431 in words is "two hundred fifteen million, four hundred twelve thousand, four hundred thirty-one".