47251921 has 2 divisors, whose sum is σ = 47251922. Its totient is φ = 47251920.

The previous prime is 47251889. The next prime is 47251927. The reversal of 47251921 is 12915274.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 32080896 + 15171025 = 5664^2 + 3895^2 .

It is a cyclic number.

It is not a de Polignac number, because 47251921 - 2⁵ = 47251889 is a prime.

It is a super-4 number, since 4×47251921⁴ (a number of 32 digits) contains 4444 as substring.

It is not a weakly prime, because it can be changed into another prime (47251927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23625960 + 23625961.

It is an arithmetic number, because the mean of its divisors is an integer number (23625961).

Almost surely, 2^47251921 is an apocalyptic number.

It is an amenable number.

47251921 is a deficient number, since it is larger than the sum of its proper divisors (1).

47251921 is an equidigital number, since it uses as much as digits as its factorization.

47251921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5040, while the sum is 31.

The square root of 47251921 is about 6874.0032732026. The cubic root of 47251921 is about 361.5262389073.

The spelling of 47251921 in words is "forty-seven million, two hundred fifty-one thousand, nine hundred twenty-one".