75444137 has 2 divisors, whose sum is σ = 75444138. Its totient is φ = 75444136.

The previous prime is 75444091. The next prime is 75444139. The reversal of 75444137 is 73144457.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 72658576 + 2785561 = 8524^2 + 1669^2 .

It is a cyclic number.

It is not a de Polignac number, because 75444137 - 2²² = 71249833 is a prime.

Together with 75444139, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 75444097 and 75444106.

It is not a weakly prime, because it can be changed into another prime (75444139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37722068 + 37722069.

It is an arithmetic number, because the mean of its divisors is an integer number (37722069).

Almost surely, 2^75444137 is an apocalyptic number.

It is an amenable number.

75444137 is a deficient number, since it is larger than the sum of its proper divisors (1).

75444137 is an equidigital number, since it uses as much as digits as its factorization.

75444137 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 47040, while the sum is 35.

The square root of 75444137 is about 8685.8584492265. The cubic root of 75444137 is about 422.5471385147.

The spelling of 75444137 in words is "seventy-five million, four hundred forty-four thousand, one hundred thirty-seven".