75418921 has 2 divisors, whose sum is σ = 75418922. Its totient is φ = 75418920.

The previous prime is 75418907. The next prime is 75419011. The reversal of 75418921 is 12981457.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 75064896 + 354025 = 8664^2 + 595^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-75418921 is a prime.

It is not a weakly prime, because it can be changed into another prime (75418901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37709460 + 37709461.

It is an arithmetic number, because the mean of its divisors is an integer number (37709461).

Almost surely, 2^75418921 is an apocalyptic number.

It is an amenable number.

75418921 is a deficient number, since it is larger than the sum of its proper divisors (1).

75418921 is an equidigital number, since it uses as much as digits as its factorization.

75418921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20160, while the sum is 37.

The square root of 75418921 is about 8684.4067730617. The cubic root of 75418921 is about 422.5000567207.

The spelling of 75418921 in words is "seventy-five million, four hundred eighteen thousand, nine hundred twenty-one".