47721491 has 2 divisors, whose sum is σ = 47721492. Its totient is φ = 47721490.

The previous prime is 47721469. The next prime is 47721503. The reversal of 47721491 is 19412774.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 47721491 - 2¹⁰ = 47720467 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (47721691) 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 as a sum of consecutive naturals, namely, 23860745 + 23860746.

It is an arithmetic number, because the mean of its divisors is an integer number (23860746).

Almost surely, 2^47721491 is an apocalyptic number.

47721491 is a deficient number, since it is larger than the sum of its proper divisors (1).

47721491 is an equidigital number, since it uses as much as digits as its factorization.

47721491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14112, while the sum is 35.

The square root of 47721491 is about 6908.0743337055. The cubic root of 47721491 is about 362.7198596503.

The spelling of 47721491 in words is "forty-seven million, seven hundred twenty-one thousand, four hundred ninety-one".