1550722139 has 2 divisors, whose sum is σ = 1550722140. Its totient is φ = 1550722138.

The previous prime is 1550722109. The next prime is 1550722157. The reversal of 1550722139 is 9312270551.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1550722139 - 2²⁰ = 1549673563 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 1550722099 and 1550722108.

It is not a weakly prime, because it can be changed into another prime (1550722109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 775361069 + 775361070.

It is an arithmetic number, because the mean of its divisors is an integer number (775361070).

Almost surely, 2^1550722139 is an apocalyptic number.

1550722139 is a deficient number, since it is larger than the sum of its proper divisors (1).

1550722139 is an equidigital number, since it uses as much as digits as its factorization.

1550722139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18900, while the sum is 35.

The square root of 1550722139 is about 39379.2094765753. The cubic root of 1550722139 is about 1157.4742257057.

The spelling of 1550722139 in words is "one billion, five hundred fifty million, seven hundred twenty-two thousand, one hundred thirty-nine".