55621469 has 4 divisors (see below), whose sum is σ = 55652544. Its totient is φ = 55590396.

The previous prime is 55621459. The next prime is 55621477. The reversal of 55621469 is 96412655.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 96412655 = 5 ⋅19282531.

It is a cyclic number.

It is not a de Polignac number, because 55621469 - 2⁴ = 55621453 is a prime.

It is a super-2 number, since 2×55621469² = 6187495627435922, 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 (55621459) 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, 12677 + ... + 16490.

It is an arithmetic number, because the mean of its divisors is an integer number (13913136).

Almost surely, 2^55621469 is an apocalyptic number.

It is an amenable number.

55621469 is a deficient number, since it is larger than the sum of its proper divisors (31075).

55621469 is a wasteful number, since it uses less digits than its factorization.

55621469 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31074.

The product of its digits is 64800, while the sum is 38.

The square root of 55621469 is about 7457.9802225536. The cubic root of 55621469 is about 381.7222586614.

The spelling of 55621469 in words is "fifty-five million, six hundred twenty-one thousand, four hundred sixty-nine".