75231661 has 4 divisors (see below), whose sum is σ = 75254400. Its totient is φ = 75208924.

The previous prime is 75231649. The next prime is 75231677. The reversal of 75231661 is 16613257.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-75231661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (75231601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5341 + ... + 13378.

It is an arithmetic number, because the mean of its divisors is an integer number (18813600).

Almost surely, 2^75231661 is an apocalyptic number.

It is an amenable number.

75231661 is a deficient number, since it is larger than the sum of its proper divisors (22739).

75231661 is a wasteful number, since it uses less digits than its factorization.

75231661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22738.

The product of its digits is 7560, while the sum is 31.

The square root of 75231661 is about 8673.6186796515. The cubic root of 75231661 is about 422.1500873716.

The spelling of 75231661 in words is "seventy-five million, two hundred thirty-one thousand, six hundred sixty-one".