215740051 has 4 divisors (see below), whose sum is σ = 219810672. Its totient is φ = 211669432.

The previous prime is 215740043. The next prime is 215740061. The reversal of 215740051 is 150047512.

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 215740051 - 2³ = 215740043 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 215739998 and 215740025.

It is not an unprimeable number, because it can be changed into a prime (215740001) 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, 2035231 + ... + 2035336.

It is an arithmetic number, because the mean of its divisors is an integer number (54952668).

Almost surely, 2^215740051 is an apocalyptic number.

215740051 is a deficient number, since it is larger than the sum of its proper divisors (4070621).

215740051 is an equidigital number, since it uses as much as digits as its factorization.

215740051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4070620.

The product of its (nonzero) digits is 1400, while the sum is 25.

The square root of 215740051 is about 14688.0921497654. The cubic root of 215740051 is about 599.7592098613.

Adding to 215740051 its reverse (150047512), we get a palindrome (365787563).

The spelling of 215740051 in words is "two hundred fifteen million, seven hundred forty thousand, fifty-one".