47978531 has 4 divisors (see below), whose sum is σ = 47992632. Its totient is φ = 47964432.

The previous prime is 47978527. The next prime is 47978551. The reversal of 47978531 is 13587974.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 47978531 - 2² = 47978527 is a prime.

It is a super-2 number, since 2×47978531² = 4603878873835922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (47978551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1556 + ... + 9918.

It is an arithmetic number, because the mean of its divisors is an integer number (11998158).

Almost surely, 2^47978531 is an apocalyptic number.

47978531 is a deficient number, since it is larger than the sum of its proper divisors (14101).

47978531 is an equidigital number, since it uses as much as digits as its factorization.

47978531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14100.

The product of its digits is 211680, while the sum is 44.

The square root of 47978531 is about 6926.6536653712. The cubic root of 47978531 is about 363.3699274835.

The spelling of 47978531 in words is "forty-seven million, nine hundred seventy-eight thousand, five hundred thirty-one".