75138779 has 2 divisors, whose sum is σ = 75138780. Its totient is φ = 75138778.

The previous prime is 75138757. The next prime is 75138781. The reversal of 75138779 is 97783157.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 75138779 - 2⁸ = 75138523 is a prime.

It is a super-2 number, since 2×75138779² = 11291672219221682, which contains 22 as substring.

Together with 75138781, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (75188779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37569389 + 37569390.

It is an arithmetic number, because the mean of its divisors is an integer number (37569390).

Almost surely, 2^75138779 is an apocalyptic number.

75138779 is a deficient number, since it is larger than the sum of its proper divisors (1).

75138779 is an equidigital number, since it uses as much as digits as its factorization.

75138779 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 370440, while the sum is 47.

The square root of 75138779 is about 8668.2627440566. The cubic root of 75138779 is about 421.9762851389.

The spelling of 75138779 in words is "seventy-five million, one hundred thirty-eight thousand, seven hundred seventy-nine".