55390949 has 2 divisors, whose sum is σ = 55390950. Its totient is φ = 55390948.

The previous prime is 55390921. The next prime is 55390987. The reversal of 55390949 is 94909355.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39150049 + 16240900 = 6257^2 + 4030^2 .

It is a cyclic number.

It is not a de Polignac number, because 55390949 - 2²⁰ = 54342373 is a prime.

It is a super-2 number, since 2×55390949² = 6136314462241202, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55390919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27695474 + 27695475.

It is an arithmetic number, because the mean of its divisors is an integer number (27695475).

Almost surely, 2^55390949 is an apocalyptic number.

It is an amenable number.

55390949 is a deficient number, since it is larger than the sum of its proper divisors (1).

55390949 is an equidigital number, since it uses as much as digits as its factorization.

55390949 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 218700, while the sum is 44.

The square root of 55390949 is about 7442.5095901853. The cubic root of 55390949 is about 381.1941864367.

The spelling of 55390949 in words is "fifty-five million, three hundred ninety thousand, nine hundred forty-nine".