1550213123 has 4 divisors (see below), whose sum is σ = 1551115608. Its totient is φ = 1549310640.

The previous prime is 1550213113. The next prime is 1550213209. The reversal of 1550213123 is 3213120551.

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: 3213120551 = 9439 ⋅340409.

It is a cyclic number.

It is not a de Polignac number, because 1550213123 - 2¹⁶ = 1550147587 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1550213113) 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, 448661 + ... + 452102.

It is an arithmetic number, because the mean of its divisors is an integer number (387778902).

Almost surely, 2^1550213123 is an apocalyptic number.

1550213123 is a deficient number, since it is larger than the sum of its proper divisors (902485).

1550213123 is an equidigital number, since it uses as much as digits as its factorization.

1550213123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 902484.

The product of its (nonzero) digits is 900, while the sum is 23.

The square root of 1550213123 is about 39372.7459418314. The cubic root of 1550213123 is about 1157.3475670001.

Adding to 1550213123 its reverse (3213120551), we get a palindrome (4763333674).

The spelling of 1550213123 in words is "one billion, five hundred fifty million, two hundred thirteen thousand, one hundred twenty-three".