75271561 has 2 divisors, whose sum is σ = 75271562. Its totient is φ = 75271560.

The previous prime is 75271519. The next prime is 75271577. The reversal of 75271561 is 16517257.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 44302336 + 30969225 = 6656^2 + 5565^2 .

It is a cyclic number.

It is not a de Polignac number, because 75271561 - 2¹⁷ = 75140489 is a prime.

It is a super-3 number, since 3×75271561³ (a number of 25 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (75271591) 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, 37635780 + 37635781.

It is an arithmetic number, because the mean of its divisors is an integer number (37635781).

Almost surely, 2^75271561 is an apocalyptic number.

It is an amenable number.

75271561 is a deficient number, since it is larger than the sum of its proper divisors (1).

75271561 is an equidigital number, since it uses as much as digits as its factorization.

75271561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14700, while the sum is 34.

The square root of 75271561 is about 8675.9184528210. The cubic root of 75271561 is about 422.2247049433.

The spelling of 75271561 in words is "seventy-five million, two hundred seventy-one thousand, five hundred sixty-one".