47521215 has 32 divisors (see below), whose sum is σ = 96552960. Its totient is φ = 21723552.

The previous prime is 47521211. The next prime is 47521219. The reversal of 47521215 is 51212574.

It is an interprime number because it is at equal distance from previous prime (47521211) and next prime (47521219).

It is not a de Polignac number, because 47521215 - 2² = 47521211 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47521211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 24199 + ... + 26088.

It is an arithmetic number, because the mean of its divisors is an integer number (3017280).

Almost surely, 2^47521215 is an apocalyptic number.

47521215 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

47521215 is an abundant number, since it is smaller than the sum of its proper divisors (49031745).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

47521215 is a wasteful number, since it uses less digits than its factorization.

47521215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50308 (or 50302 counting only the distinct ones).

The product of its digits is 2800, while the sum is 27.

The square root of 47521215 is about 6893.5633020957. The cubic root of 47521215 is about 362.2117311870.

Adding to 47521215 its reverse (51212574), we get a palindrome (98733789).

The spelling of 47521215 in words is "forty-seven million, five hundred twenty-one thousand, two hundred fifteen".