47922991 has 4 divisors (see below), whose sum is σ = 47940984. Its totient is φ = 47905000.

The previous prime is 47922989. The next prime is 47923009. The reversal of 47922991 is 19922974.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19922974 = 2 ⋅9961487.

It is a cyclic number.

It is not a de Polignac number, because 47922991 - 2¹ = 47922989 is a prime.

It is a super-2 number, since 2×47922991² = 4593226132772162, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47922911) 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, 4120 + ... + 10621.

It is an arithmetic number, because the mean of its divisors is an integer number (11985246).

Almost surely, 2^47922991 is an apocalyptic number.

47922991 is a deficient number, since it is larger than the sum of its proper divisors (17993).

47922991 is a wasteful number, since it uses less digits than its factorization.

47922991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17992.

The product of its digits is 81648, while the sum is 43.

The square root of 47922991 is about 6922.6433535175. The cubic root of 47922991 is about 363.2296608700.

The spelling of 47922991 in words is "forty-seven million, nine hundred twenty-two thousand, nine hundred ninety-one".