47547991 has 2 divisors, whose sum is σ = 47547992. Its totient is φ = 47547990.

The previous prime is 47547977. The next prime is 47548009. The reversal of 47547991 is 19974574.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 47547991 - 2¹³ = 47539799 is a prime.

It is a super-2 number, since 2×47547991² = 4521622896272162, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (47547901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23773995 + 23773996.

It is an arithmetic number, because the mean of its divisors is an integer number (23773996).

Almost surely, 2^47547991 is an apocalyptic number.

47547991 is a deficient number, since it is larger than the sum of its proper divisors (1).

47547991 is an equidigital number, since it uses as much as digits as its factorization.

47547991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 317520, while the sum is 46.

The square root of 47547991 is about 6895.5051301554. The cubic root of 47547991 is about 362.2797482493.

The spelling of 47547991 in words is "forty-seven million, five hundred forty-seven thousand, nine hundred ninety-one".