55429919 has 4 divisors (see below), whose sum is σ = 55720320. Its totient is φ = 55139520.

The previous prime is 55429901. The next prime is 55429921. The reversal of 55429919 is 91992455.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55429919 is a prime.

It is a super-2 number, since 2×55429919² = 6144951840693122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 55429919.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55429939) 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, 144914 + ... + 145295.

It is an arithmetic number, because the mean of its divisors is an integer number (13930080).

Almost surely, 2^55429919 is an apocalyptic number.

55429919 is a deficient number, since it is larger than the sum of its proper divisors (290401).

55429919 is a wasteful number, since it uses less digits than its factorization.

55429919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 290400.

The product of its digits is 145800, while the sum is 44.

The square root of 55429919 is about 7445.1271983761. The cubic root of 55429919 is about 381.2835611771.

The spelling of 55429919 in words is "fifty-five million, four hundred twenty-nine thousand, nine hundred nineteen".