47128919 has 2 divisors, whose sum is σ = 47128920. Its totient is φ = 47128918.

The previous prime is 47128889. The next prime is 47128943. The reversal of 47128919 is 91982174.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 47128919 - 2¹² = 47124823 is a prime.

It is a super-2 number, since 2×47128919² = 4442270012217122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (47128979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23564459 + 23564460.

It is an arithmetic number, because the mean of its divisors is an integer number (23564460).

Almost surely, 2^47128919 is an apocalyptic number.

47128919 is a deficient number, since it is larger than the sum of its proper divisors (1).

47128919 is an equidigital number, since it uses as much as digits as its factorization.

47128919 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36288, while the sum is 41.

The square root of 47128919 is about 6865.0505460630. The cubic root of 47128919 is about 361.2122686613.

It can be divided in two parts, 4712 and 8919, that added together give a palindrome (13631).

The spelling of 47128919 in words is "forty-seven million, one hundred twenty-eight thousand, nine hundred nineteen".