75445861 has 2 divisors, whose sum is σ = 75445862. Its totient is φ = 75445860.

The previous prime is 75445859. The next prime is 75445873. The reversal of 75445861 is 16854457.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 44809636 + 30636225 = 6694^2 + 5535^2 .

It is a cyclic number.

It is not a de Polignac number, because 75445861 - 2¹ = 75445859 is a prime.

Together with 75445859, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (75445841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37722930 + 37722931.

It is an arithmetic number, because the mean of its divisors is an integer number (37722931).

Almost surely, 2^75445861 is an apocalyptic number.

It is an amenable number.

75445861 is a deficient number, since it is larger than the sum of its proper divisors (1).

75445861 is an equidigital number, since it uses as much as digits as its factorization.

75445861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 134400, while the sum is 40.

The square root of 75445861 is about 8685.9576904335. The cubic root of 75445861 is about 422.5503570803.

The spelling of 75445861 in words is "seventy-five million, four hundred forty-five thousand, eight hundred sixty-one".