55083721 has 8 divisors (see below), whose sum is σ = 68675904. Its totient is φ = 42922320.

The previous prime is 55083709. The next prime is 55083733. The reversal of 55083721 is 12738055.

It is an interprime number because it is at equal distance from previous prime (55083709) and next prime (55083733).

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

It is not a de Polignac number, because 55083721 - 2¹¹ = 55081673 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55083701) 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, 357610 + ... + 357763.

It is an arithmetic number, because the mean of its divisors is an integer number (8584488).

Almost surely, 2^55083721 is an apocalyptic number.

It is an amenable number.

55083721 is a deficient number, since it is larger than the sum of its proper divisors (13592183).

55083721 is a wasteful number, since it uses less digits than its factorization.

55083721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 715391.

The product of its (nonzero) digits is 8400, while the sum is 31.

The square root of 55083721 is about 7421.8408093949. The cubic root of 55083721 is about 380.4881100579.

It can be divided in two parts, 5508 and 3721, that added together give a palindrome (9229).

The spelling of 55083721 in words is "fifty-five million, eighty-three thousand, seven hundred twenty-one".