55722031 has 4 divisors (see below), whose sum is σ = 58144752. Its totient is φ = 53299312.

The previous prime is 55721959. The next prime is 55722047. The reversal of 55722031 is 13022755.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 55722031 - 2¹³ = 55713839 is a prime.

It is a super-2 number, since 2×55722031² = 6209889477529922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 55721987 and 55722005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55722061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1211326 + ... + 1211371.

It is an arithmetic number, because the mean of its divisors is an integer number (14536188).

Almost surely, 2^55722031 is an apocalyptic number.

55722031 is a deficient number, since it is larger than the sum of its proper divisors (2422721).

55722031 is a wasteful number, since it uses less digits than its factorization.

55722031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2422720.

The product of its (nonzero) digits is 2100, while the sum is 25.

The square root of 55722031 is about 7464.7190837968. The cubic root of 55722031 is about 381.9521677452.

Adding to 55722031 its reverse (13022755), we get a palindrome (68744786).

The spelling of 55722031 in words is "fifty-five million, seven hundred twenty-two thousand, thirty-one".