1550279149 has 4 divisors (see below), whose sum is σ = 1550373820. Its totient is φ = 1550184480.

The previous prime is 1550279131. The next prime is 1550279183. The reversal of 1550279149 is 9419720551.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 9419720551 = 79 ⋅119236969.

It can be written as a sum of positive squares in 2 ways, for example, as 804006025 + 746273124 = 28355^2 + 27318^2 .

It is a cyclic number.

It is not a de Polignac number, because 1550279149 - 2⁵ = 1550279117 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1550279119) 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, 15744 + ... + 57865.

It is an arithmetic number, because the mean of its divisors is an integer number (387593455).

Almost surely, 2^1550279149 is an apocalyptic number.

It is an amenable number.

1550279149 is a deficient number, since it is larger than the sum of its proper divisors (94671).

1550279149 is an equidigital number, since it uses as much as digits as its factorization.

1550279149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94670.

The product of its (nonzero) digits is 113400, while the sum is 43.

The square root of 1550279149 is about 39373.5844062996. The cubic root of 1550279149 is about 1157.3639978475.

The spelling of 1550279149 in words is "one billion, five hundred fifty million, two hundred seventy-nine thousand, one hundred forty-nine".