75915991 has 2 divisors, whose sum is σ = 75915992. Its totient is φ = 75915990.

The previous prime is 75915979. The next prime is 75916003. The reversal of 75915991 is 19951957.

It is a balanced prime because it is at equal distance from previous prime (75915979) and next prime (75916003).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-75915991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (75915911) 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, 37957995 + 37957996.

It is an arithmetic number, because the mean of its divisors is an integer number (37957996).

Almost surely, 2^75915991 is an apocalyptic number.

75915991 is a deficient number, since it is larger than the sum of its proper divisors (1).

75915991 is an equidigital number, since it uses as much as digits as its factorization.

75915991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 127575, while the sum is 46.

The square root of 75915991 is about 8712.9783082480. The cubic root of 75915991 is about 423.4262275045.

The spelling of 75915991 in words is "seventy-five million, nine hundred fifteen thousand, nine hundred ninety-one".