55090731 has 4 divisors (see below), whose sum is σ = 73454312. Its totient is φ = 36727152.

The previous prime is 55090699. The next prime is 55090741. The reversal of 55090731 is 13709055.

It is a happy number.

55090731 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 55090731 - 2⁵ = 55090699 is a prime.

It is a super-2 number, since 2×55090731² = 6069977284228722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55090741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9181786 + ... + 9181791.

It is an arithmetic number, because the mean of its divisors is an integer number (18363578).

Almost surely, 2^55090731 is an apocalyptic number.

55090731 is a deficient number, since it is larger than the sum of its proper divisors (18363581).

55090731 is a wasteful number, since it uses less digits than its factorization.

55090731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18363580.

The product of its (nonzero) digits is 4725, while the sum is 30.

The square root of 55090731 is about 7422.3130491781. The cubic root of 55090731 is about 380.5042497840.

Adding to 55090731 its reverse (13709055), we get a palindrome (68799786).

The spelling of 55090731 in words is "fifty-five million, ninety thousand, seven hundred thirty-one".