47915557 has 4 divisors (see below), whose sum is σ = 48590496. Its totient is φ = 47240620.

The previous prime is 47915507. The next prime is 47915573. The reversal of 47915557 is 75551974.

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, and also an emirpimes, since its reverse is a distinct semiprime: 75551974 = 2 ⋅37775987.

It is a cyclic number.

It is not a de Polignac number, because 47915557 - 2¹⁹ = 47391269 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 (47915507) 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, 337363 + ... + 337504.

It is an arithmetic number, because the mean of its divisors is an integer number (12147624).

Almost surely, 2^47915557 is an apocalyptic number.

It is an amenable number.

47915557 is a deficient number, since it is larger than the sum of its proper divisors (674939).

47915557 is an equidigital number, since it uses as much as digits as its factorization.

47915557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 674938.

The product of its digits is 220500, while the sum is 43.

The square root of 47915557 is about 6922.1063990667. The cubic root of 47915557 is about 363.2108780348.

The spelling of 47915557 in words is "forty-seven million, nine hundred fifteen thousand, five hundred fifty-seven".