75221947 has 2 divisors, whose sum is σ = 75221948. Its totient is φ = 75221946.

The previous prime is 75221941. The next prime is 75221989. The reversal of 75221947 is 74912257.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 75221947 - 2¹¹ = 75219899 is a prime.

It is not a weakly prime, because it can be changed into another prime (75221941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37610973 + 37610974.

It is an arithmetic number, because the mean of its divisors is an integer number (37610974).

Almost surely, 2^75221947 is an apocalyptic number.

75221947 is a deficient number, since it is larger than the sum of its proper divisors (1).

75221947 is an equidigital number, since it uses as much as digits as its factorization.

75221947 is an evil number, because the sum of its binary digits is even.

The product of its digits is 35280, while the sum is 37.

The square root of 75221947 is about 8673.0586876834. The cubic root of 75221947 is about 422.1319170852.

The spelling of 75221947 in words is "seventy-five million, two hundred twenty-one thousand, nine hundred forty-seven".