47991297 has 4 divisors (see below), whose sum is σ = 63988400. Its totient is φ = 31994196.

The previous prime is 47991287. The next prime is 47991313. The reversal of 47991297 is 79219974.

It is a happy number.

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 not a de Polignac number, because 47991297 - 2¹² = 47987201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (47991227) 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, 7998547 + ... + 7998552.

It is an arithmetic number, because the mean of its divisors is an integer number (15997100).

Almost surely, 2^47991297 is an apocalyptic number.

It is an amenable number.

47991297 is a deficient number, since it is larger than the sum of its proper divisors (15997103).

47991297 is a wasteful number, since it uses less digits than its factorization.

47991297 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15997102.

The product of its digits is 285768, while the sum is 48.

The square root of 47991297 is about 6927.5751168789. The cubic root of 47991297 is about 363.4021527937.

The spelling of 47991297 in words is "forty-seven million, nine hundred ninety-one thousand, two hundred ninety-seven".