55215401 has 4 divisors (see below), whose sum is σ = 55347600. Its totient is φ = 55083204.

The previous prime is 55215389. The next prime is 55215421. The reversal of 55215401 is 10451255.

It is a happy number.

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: 10451255 = 5 ⋅2090251.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55215401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55215421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65471 + ... + 66308.

It is an arithmetic number, because the mean of its divisors is an integer number (13836900).

Almost surely, 2^55215401 is an apocalyptic number.

It is an amenable number.

55215401 is a deficient number, since it is larger than the sum of its proper divisors (132199).

55215401 is a wasteful number, since it uses less digits than its factorization.

55215401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132198.

The product of its (nonzero) digits is 1000, while the sum is 23.

The square root of 55215401 is about 7430.7066285785. The cubic root of 55215401 is about 380.7910598355.

Adding to 55215401 its reverse (10451255), we get a palindrome (65666656).

The spelling of 55215401 in words is "fifty-five million, two hundred fifteen thousand, four hundred one".