47690921 has 2 divisors, whose sum is σ = 47690922. Its totient is φ = 47690920.

The previous prime is 47690873. The next prime is 47690963. The reversal of 47690921 is 12909674.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 34810000 + 12880921 = 5900^2 + 3589^2 .

It is a cyclic number.

It is not a de Polignac number, because 47690921 - 2⁶ = 47690857 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 (47690971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23845460 + 23845461.

It is an arithmetic number, because the mean of its divisors is an integer number (23845461).

Almost surely, 2^47690921 is an apocalyptic number.

It is an amenable number.

47690921 is a deficient number, since it is larger than the sum of its proper divisors (1).

47690921 is an equidigital number, since it uses as much as digits as its factorization.

47690921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27216, while the sum is 38.

The square root of 47690921 is about 6905.8613510553. The cubic root of 47690921 is about 362.6423913062.

The spelling of 47690921 in words is "forty-seven million, six hundred ninety thousand, nine hundred twenty-one".