75504991 has 2 divisors, whose sum is σ = 75504992. Its totient is φ = 75504990.

The previous prime is 75504977. The next prime is 75504997. The reversal of 75504991 is 19940557.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 75504991 - 2¹⁷ = 75373919 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (75504997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37752495 + 37752496.

It is an arithmetic number, because the mean of its divisors is an integer number (37752496).

Almost surely, 2^75504991 is an apocalyptic number.

75504991 is a deficient number, since it is larger than the sum of its proper divisors (1).

75504991 is an equidigital number, since it uses as much as digits as its factorization.

75504991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 56700, while the sum is 40.

The square root of 75504991 is about 8689.3607935222. The cubic root of 75504991 is about 422.6607182398.

The spelling of 75504991 in words is "seventy-five million, five hundred four thousand, nine hundred ninety-one".