47515621 has 4 divisors (see below), whose sum is σ = 47857600. Its totient is φ = 47173644.

The previous prime is 47515603. The next prime is 47515639. The reversal of 47515621 is 12651574.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (47515603) and next prime (47515639).

It is a cyclic number.

It is not a de Polignac number, because 47515621 - 2¹⁷ = 47384549 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 (47515681) 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, 170781 + ... + 171058.

It is an arithmetic number, because the mean of its divisors is an integer number (11964400).

Almost surely, 2^47515621 is an apocalyptic number.

It is an amenable number.

47515621 is a deficient number, since it is larger than the sum of its proper divisors (341979).

47515621 is a wasteful number, since it uses less digits than its factorization.

47515621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 341978.

The product of its digits is 8400, while the sum is 31.

The square root of 47515621 is about 6893.1575493383. The cubic root of 47515621 is about 362.1975179426.

The spelling of 47515621 in words is "forty-seven million, five hundred fifteen thousand, six hundred twenty-one".