55722131 has 2 divisors, whose sum is σ = 55722132. Its totient is φ = 55722130.

The previous prime is 55722127. The next prime is 55722167. The reversal of 55722131 is 13122755.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 55722131 - 2² = 55722127 is a prime.

It is a super-2 number, since 2×55722131² = 6209911766362322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 55722131.

It is not a weakly prime, because it can be changed into another prime (55722101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27861065 + 27861066.

It is an arithmetic number, because the mean of its divisors is an integer number (27861066).

Almost surely, 2^55722131 is an apocalyptic number.

55722131 is a deficient number, since it is larger than the sum of its proper divisors (1).

55722131 is an equidigital number, since it uses as much as digits as its factorization.

55722131 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2100, while the sum is 26.

The square root of 55722131 is about 7464.7257819695. The cubic root of 55722131 is about 381.9523962317.

Adding to 55722131 its reverse (13122755), we get a palindrome (68844886).

The spelling of 55722131 in words is "fifty-five million, seven hundred twenty-two thousand, one hundred thirty-one".