75455021 has 2 divisors, whose sum is σ = 75455022. Its totient is φ = 75455020.

The previous prime is 75454997. The next prime is 75455053. The reversal of 75455021 is 12055457.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 74476900 + 978121 = 8630^2 + 989^2 .

It is an emirp because it is prime and its reverse (12055457) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 75455021 - 2⁶ = 75454957 is a prime.

It is a super-2 number, since 2×75455021² = 11386920388220882, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (75455221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37727510 + 37727511.

It is an arithmetic number, because the mean of its divisors is an integer number (37727511).

Almost surely, 2^75455021 is an apocalyptic number.

It is an amenable number.

75455021 is a deficient number, since it is larger than the sum of its proper divisors (1).

75455021 is an equidigital number, since it uses as much as digits as its factorization.

75455021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7000, while the sum is 29.

The square root of 75455021 is about 8686.4849622848. The cubic root of 75455021 is about 422.5674572216.

The spelling of 75455021 in words is "seventy-five million, four hundred fifty-five thousand, twenty-one".