75931409 has 2 divisors, whose sum is σ = 75931410. Its totient is φ = 75931408.

The previous prime is 75931381. The next prime is 75931423. The reversal of 75931409 is 90413957.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 71351809 + 4579600 = 8447^2 + 2140^2 .

It is a cyclic number.

It is not a de Polignac number, because 75931409 - 2²⁰ = 74882833 is a prime.

It is not a weakly prime, because it can be changed into another prime (75931439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37965704 + 37965705.

It is an arithmetic number, because the mean of its divisors is an integer number (37965705).

Almost surely, 2^75931409 is an apocalyptic number.

It is an amenable number.

75931409 is a deficient number, since it is larger than the sum of its proper divisors (1).

75931409 is an equidigital number, since it uses as much as digits as its factorization.

75931409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34020, while the sum is 38.

The square root of 75931409 is about 8713.8630354166. The cubic root of 75931409 is about 423.4548905200.

The spelling of 75931409 in words is "seventy-five million, nine hundred thirty-one thousand, four hundred nine".