55549951 has 2 divisors, whose sum is σ = 55549952. Its totient is φ = 55549950.

The previous prime is 55549943. The next prime is 55549961. The reversal of 55549951 is 15994555.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 55549951 - 2³ = 55549943 is a prime.

It is a super-2 number, since 2×55549951² = 6171594112204802, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 55549898 and 55549907.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55549961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27774975 + 27774976.

It is an arithmetic number, because the mean of its divisors is an integer number (27774976).

Almost surely, 2^55549951 is an apocalyptic number.

55549951 is a deficient number, since it is larger than the sum of its proper divisors (1).

55549951 is an equidigital number, since it uses as much as digits as its factorization.

55549951 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 202500, while the sum is 43.

The square root of 55549951 is about 7453.1839505006. The cubic root of 55549951 is about 381.5585825238.

The spelling of 55549951 in words is "fifty-five million, five hundred forty-nine thousand, nine hundred fifty-one".