55905131 has 2 divisors, whose sum is σ = 55905132. Its totient is φ = 55905130.

The previous prime is 55905107. The next prime is 55905133. The reversal of 55905131 is 13150955.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 55905131 - 2⁶ = 55905067 is a prime.

It is a super-2 number, since 2×55905131² = 6250767344254322, which contains 22 as substring.

Together with 55905133, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 55905094 and 55905103.

It is not a weakly prime, because it can be changed into another prime (55905133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27952565 + 27952566.

It is an arithmetic number, because the mean of its divisors is an integer number (27952566).

Almost surely, 2^55905131 is an apocalyptic number.

55905131 is a deficient number, since it is larger than the sum of its proper divisors (1).

55905131 is an equidigital number, since it uses as much as digits as its factorization.

55905131 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3375, while the sum is 29.

The square root of 55905131 is about 7476.9733850001. The cubic root of 55905131 is about 382.3700693582.

The spelling of 55905131 in words is "fifty-five million, nine hundred five thousand, one hundred thirty-one".