49815215 has 4 divisors (see below), whose sum is σ = 59778264. Its totient is φ = 39852168.

The previous prime is 49815211. The next prime is 49815247. The reversal of 49815215 is 51251894.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 51251894 = 2 ⋅25625947.

It is a cyclic number.

It is not a de Polignac number, because 49815215 - 2² = 49815211 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (49815211) 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, 4981517 + ... + 4981526.

It is an arithmetic number, because the mean of its divisors is an integer number (14944566).

Almost surely, 2^49815215 is an apocalyptic number.

49815215 is a deficient number, since it is larger than the sum of its proper divisors (9963049).

49815215 is an equidigital number, since it uses as much as digits as its factorization.

49815215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9963048.

The product of its digits is 14400, while the sum is 35.

The square root of 49815215 is about 7057.9894445940. The cubic root of 49815215 is about 367.9487537926.

The spelling of 49815215 in words is "forty-nine million, eight hundred fifteen thousand, two hundred fifteen".