53291661 has 4 divisors (see below), whose sum is σ = 71055552. Its totient is φ = 35527772.

The previous prime is 53291657. The next prime is 53291669. The reversal of 53291661 is 16619235.

It is a happy number.

53291661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 not a de Polignac number, because 53291661 - 2² = 53291657 is a prime.

It is a super-2 number, since 2×53291661² = 5680002264277842, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53291669) 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 in 3 ways as a sum of consecutive naturals, for example, 8881941 + ... + 8881946.

It is an arithmetic number, because the mean of its divisors is an integer number (17763888).

Almost surely, 2^53291661 is an apocalyptic number.

It is an amenable number.

53291661 is a deficient number, since it is larger than the sum of its proper divisors (17763891).

53291661 is a wasteful number, since it uses less digits than its factorization.

53291661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17763890.

The product of its digits is 9720, while the sum is 33.

The square root of 53291661 is about 7300.1137662368. The cubic root of 53291661 is about 376.3163480895.

The spelling of 53291661 in words is "fifty-three million, two hundred ninety-one thousand, six hundred sixty-one".