47856691 has 2 divisors, whose sum is σ = 47856692. Its totient is φ = 47856690.

The previous prime is 47856667. The next prime is 47856701. The reversal of 47856691 is 19665874.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 47856691 - 2¹³ = 47848499 is a prime.

It is not a weakly prime, because it can be changed into another prime (47866691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23928345 + 23928346.

It is an arithmetic number, because the mean of its divisors is an integer number (23928346).

Almost surely, 2^47856691 is an apocalyptic number.

47856691 is a deficient number, since it is larger than the sum of its proper divisors (1).

47856691 is an equidigital number, since it uses as much as digits as its factorization.

47856691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 362880, while the sum is 46.

The square root of 47856691 is about 6917.8530629090. The cubic root of 47856691 is about 363.0620778360.

It can be divided in two parts, 4785 and 6691, that added together give a triangular number (11476 = T₁₅₁).

The spelling of 47856691 in words is "forty-seven million, eight hundred fifty-six thousand, six hundred ninety-one".