75731389 has 2 divisors, whose sum is σ = 75731390. Its totient is φ = 75731388.

The previous prime is 75731377. The next prime is 75731399. The reversal of 75731389 is 98313757.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38007225 + 37724164 = 6165^2 + 6142^2 .

It is a cyclic number.

It is not a de Polignac number, because 75731389 - 2⁷ = 75731261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (75731339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37865694 + 37865695.

It is an arithmetic number, because the mean of its divisors is an integer number (37865695).

Almost surely, 2^75731389 is an apocalyptic number.

It is an amenable number.

75731389 is a deficient number, since it is larger than the sum of its proper divisors (1).

75731389 is an equidigital number, since it uses as much as digits as its factorization.

75731389 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 158760, while the sum is 43.

The square root of 75731389 is about 8702.3783530711. The cubic root of 75731389 is about 423.0827391724.

The spelling of 75731389 in words is "seventy-five million, seven hundred thirty-one thousand, three hundred eighty-nine".