15550236231 has 4 divisors (see below), whose sum is σ = 20733648312. Its totient is φ = 10366824152.

The previous prime is 15550236211. The next prime is 15550236257. The reversal of 15550236231 is 13263205551.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13263205551 = 3 ⋅4421068517.

It is a cyclic number.

It is not a de Polignac number, because 15550236231 - 2¹³ = 15550228039 is a prime.

It is a super-2 number, since 2×15550236231² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 15550236192 and 15550236201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15550236211) 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, 2591706036 + ... + 2591706041.

It is an arithmetic number, because the mean of its divisors is an integer number (5183412078).

Almost surely, 2^15550236231 is an apocalyptic number.

15550236231 is a deficient number, since it is larger than the sum of its proper divisors (5183412081).

15550236231 is an equidigital number, since it uses as much as digits as its factorization.

15550236231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5183412080.

The product of its (nonzero) digits is 27000, while the sum is 33.

The spelling of 15550236231 in words is "fifteen billion, five hundred fifty million, two hundred thirty-six thousand, two hundred thirty-one".