1550420459 has 4 divisors (see below), whose sum is σ = 1771909104. Its totient is φ = 1328931816.

The previous prime is 1550420449. The next prime is 1550420471. The reversal of 1550420459 is 9540240551.

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: 9540240551 = 151 ⋅63180401.

It is a cyclic number.

It is not a de Polignac number, because 1550420459 - 2⁸ = 1550420203 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1550420419) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 110744312 + ... + 110744325.

It is an arithmetic number, because the mean of its divisors is an integer number (442977276).

Almost surely, 2^1550420459 is an apocalyptic number.

1550420459 is a deficient number, since it is larger than the sum of its proper divisors (221488645).

1550420459 is an equidigital number, since it uses as much as digits as its factorization.

1550420459 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221488644.

The product of its (nonzero) digits is 36000, while the sum is 35.

The square root of 1550420459 is about 39375.3788426219. The cubic root of 1550420459 is about 1157.3991618668.

The spelling of 1550420459 in words is "one billion, five hundred fifty million, four hundred twenty thousand, four hundred fifty-nine".