75721829 has 2 divisors, whose sum is σ = 75721830. Its totient is φ = 75721828.

The previous prime is 75721787. The next prime is 75721831. The reversal of 75721829 is 92812757.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65577604 + 10144225 = 8098^2 + 3185^2 .

It is a cyclic number.

It is not a de Polignac number, because 75721829 - 2¹⁶ = 75656293 is a prime.

Together with 75721831, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (75721889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37860914 + 37860915.

It is an arithmetic number, because the mean of its divisors is an integer number (37860915).

Almost surely, 2^75721829 is an apocalyptic number.

It is an amenable number.

75721829 is a deficient number, since it is larger than the sum of its proper divisors (1).

75721829 is an equidigital number, since it uses as much as digits as its factorization.

75721829 is an evil number, because the sum of its binary digits is even.

The product of its digits is 70560, while the sum is 41.

The square root of 75721829 is about 8701.8290606056. The cubic root of 75721829 is about 423.0649357171.

The spelling of 75721829 in words is "seventy-five million, seven hundred twenty-one thousand, eight hundred twenty-nine".