53961691 has 24 divisors (see below), whose sum is σ = 66690000. Its totient is φ = 43412544.

The previous prime is 53961683. The next prime is 53961701. The reversal of 53961691 is 19616935.

It is not a de Polignac number, because 53961691 - 2³ = 53961683 is a prime.

It is not an unprimeable number, because it can be changed into a prime (53961601) 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 23 ways as a sum of consecutive naturals, for example, 138525 + ... + 138913.

It is an arithmetic number, because the mean of its divisors is an integer number (2778750).

Almost surely, 2^53961691 is an apocalyptic number.

53961691 is a deficient number, since it is larger than the sum of its proper divisors (12728309).

53961691 is a wasteful number, since it uses less digits than its factorization.

53961691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 571 (or 564 counting only the distinct ones).

The product of its digits is 43740, while the sum is 40.

The square root of 53961691 is about 7345.8621685953. The cubic root of 53961691 is about 377.8869117577.

The spelling of 53961691 in words is "fifty-three million, nine hundred sixty-one thousand, six hundred ninety-one".