55313989 has 2 divisors, whose sum is σ = 55313990. Its totient is φ = 55313988.

The previous prime is 55313981. The next prime is 55314019. The reversal of 55313989 is 98931355.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 49350625 + 5963364 = 7025^2 + 2442^2 .

It is a cyclic number.

It is not a de Polignac number, because 55313989 - 2³ = 55313981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55313981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27656994 + 27656995.

It is an arithmetic number, because the mean of its divisors is an integer number (27656995).

Almost surely, 2^55313989 is an apocalyptic number.

It is an amenable number.

55313989 is a deficient number, since it is larger than the sum of its proper divisors (1).

55313989 is an equidigital number, since it uses as much as digits as its factorization.

55313989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 145800, while the sum is 43.

The square root of 55313989 is about 7437.3374940230. The cubic root of 55313989 is about 381.0175612997.

The spelling of 55313989 in words is "fifty-five million, three hundred thirteen thousand, nine hundred eighty-nine".