75531557 has 2 divisors, whose sum is σ = 75531558. Its totient is φ = 75531556.

The previous prime is 75531551. The next prime is 75531581. The reversal of 75531557 is 75513557.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 48011041 + 27520516 = 6929^2 + 5246^2 .

It is a cyclic number.

It is not a de Polignac number, because 75531557 - 2⁸ = 75531301 is a prime.

It is a super-2 number, since 2×75531557² = 11410032205688498, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 75531557.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (75531551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37765778 + 37765779.

It is an arithmetic number, because the mean of its divisors is an integer number (37765779).

Almost surely, 2^75531557 is an apocalyptic number.

It is an amenable number.

75531557 is a deficient number, since it is larger than the sum of its proper divisors (1).

75531557 is an equidigital number, since it uses as much as digits as its factorization.

75531557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 91875, while the sum is 38.

The square root of 75531557 is about 8690.8893100764. The cubic root of 75531557 is about 422.7102826808.

The spelling of 75531557 in words is "seventy-five million, five hundred thirty-one thousand, five hundred fifty-seven".