55490069 has 4 divisors (see below), whose sum is σ = 55895244. Its totient is φ = 55084896.

The previous prime is 55490063. The next prime is 55490101. The reversal of 55490069 is 96009455.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 25623844 + 29866225 = 5062^2 + 5465^2 .

It is a cyclic number.

It is not a de Polignac number, because 55490069 - 2⁸ = 55489813 is a prime.

It is a super-2 number, since 2×55490069² = 6158295515249522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55490063) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 202382 + ... + 202655.

It is an arithmetic number, because the mean of its divisors is an integer number (13973811).

Almost surely, 2^55490069 is an apocalyptic number.

It is an amenable number.

55490069 is a deficient number, since it is larger than the sum of its proper divisors (405175).

55490069 is a wasteful number, since it uses less digits than its factorization.

55490069 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 405174.

The product of its (nonzero) digits is 48600, while the sum is 38.

The square root of 55490069 is about 7449.1656579781. The cubic root of 55490069 is about 381.4214284510.

It can be divided in two parts, 5 and 5490069, that multiplied together give a triangular number (27450345 = T₇₄₀₉).

The spelling of 55490069 in words is "fifty-five million, four hundred ninety thousand, sixty-nine".