75611989 has 2 divisors, whose sum is σ = 75611990. Its totient is φ = 75611988.

The previous prime is 75611957. The next prime is 75611999. The reversal of 75611989 is 98911657.

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., 54982225 + 20629764 = 7415^2 + 4542^2 .

It is a cyclic number.

It is not a de Polignac number, because 75611989 - 2⁵ = 75611957 is a prime.

It is a super-2 number, since 2×75611989² = 11434345761072242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (75611929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37805994 + 37805995.

It is an arithmetic number, because the mean of its divisors is an integer number (37805995).

Almost surely, 2^75611989 is an apocalyptic number.

It is an amenable number.

75611989 is a deficient number, since it is larger than the sum of its proper divisors (1).

75611989 is an equidigital number, since it uses as much as digits as its factorization.

75611989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 136080, while the sum is 46.

The square root of 75611989 is about 8695.5154533817. The cubic root of 75611989 is about 422.8602746114.

The spelling of 75611989 in words is "seventy-five million, six hundred eleven thousand, nine hundred eighty-nine".