47618521 has 2 divisors, whose sum is σ = 47618522. Its totient is φ = 47618520.

The previous prime is 47618497. The next prime is 47618537. The reversal of 47618521 is 12581674.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 47403225 + 215296 = 6885^2 + 464^2 .

It is a cyclic number.

It is not a de Polignac number, because 47618521 - 2²¹ = 45521369 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is not a weakly prime, because it can be changed into another prime (47618621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23809260 + 23809261.

It is an arithmetic number, because the mean of its divisors is an integer number (23809261).

Almost surely, 2^47618521 is an apocalyptic number.

It is an amenable number.

47618521 is a deficient number, since it is larger than the sum of its proper divisors (1).

47618521 is an equidigital number, since it uses as much as digits as its factorization.

47618521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13440, while the sum is 34.

The square root of 47618521 is about 6900.6174361429. The cubic root of 47618521 is about 362.4587881805.

The spelling of 47618521 in words is "forty-seven million, six hundred eighteen thousand, five hundred twenty-one".