1550420231 has 4 divisors (see below), whose sum is σ = 1576698600. Its totient is φ = 1524141864.

The previous prime is 1550420203. The next prime is 1550420237. The reversal of 1550420231 is 1320240551.

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

It is a cyclic number.

It is not a de Polignac number, because 1550420231 - 2⁶ = 1550420167 is a prime.

It is a super-3 number, since 3×1550420231³ (a number of 29 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1550420197 and 1550420206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1550420237) 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, 13139096 + ... + 13139213.

It is an arithmetic number, because the mean of its divisors is an integer number (394174650).

Almost surely, 2^1550420231 is an apocalyptic number.

1550420231 is a deficient number, since it is larger than the sum of its proper divisors (26278369).

1550420231 is an equidigital number, since it uses as much as digits as its factorization.

1550420231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26278368.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 1550420231 is about 39375.3759474116. The cubic root of 1550420231 is about 1157.3991051322.

Adding to 1550420231 its reverse (1320240551), we get a palindrome (2870660782).

The spelling of 1550420231 in words is "one billion, five hundred fifty million, four hundred twenty thousand, two hundred thirty-one".