53991961 has 8 divisors (see below), whose sum is σ = 55410080. Its totient is φ = 52581312.

The previous prime is 53991947. The next prime is 53991967. The reversal of 53991961 is 16919935.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 53991961 - 2⁵ = 53991929 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (53991967) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14641 + ... + 17953.

It is an arithmetic number, because the mean of its divisors is an integer number (6926260).

Almost surely, 2^53991961 is an apocalyptic number.

It is an amenable number.

53991961 is a deficient number, since it is larger than the sum of its proper divisors (1418119).

53991961 is a wasteful number, since it uses less digits than its factorization.

53991961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3735.

The product of its digits is 65610, while the sum is 43.

The square root of 53991961 is about 7347.9222233227. The cubic root of 53991961 is about 377.9575575463.

The spelling of 53991961 in words is "fifty-three million, nine hundred ninety-one thousand, nine hundred sixty-one".