215130431 has 4 divisors (see below), whose sum is σ = 224483952. Its totient is φ = 205776912.

The previous prime is 215130413. The next prime is 215130437. The reversal of 215130431 is 134031512.

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 215130431 - 2¹⁴ = 215114047 is a prime.

It is a super-2 number, since 2×215130431² = 92562204684491522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215130437) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4676726 + ... + 4676771.

It is an arithmetic number, because the mean of its divisors is an integer number (56120988).

Almost surely, 2^215130431 is an apocalyptic number.

215130431 is a deficient number, since it is larger than the sum of its proper divisors (9353521).

215130431 is an equidigital number, since it uses as much as digits as its factorization.

215130431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9353520.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 215130431 is about 14667.3252844546. The cubic root of 215130431 is about 599.1937606339.

Adding to 215130431 its reverse (134031512), we get a palindrome (349161943).

The spelling of 215130431 in words is "two hundred fifteen million, one hundred thirty thousand, four hundred thirty-one".