1550743979 has 2 divisors, whose sum is σ = 1550743980. Its totient is φ = 1550743978.

The previous prime is 1550743967. The next prime is 1550743993. The reversal of 1550743979 is 9793470551.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1550743979 - 2²⁸ = 1282308523 is a prime.

It is not a weakly prime, because it can be changed into another prime (1550743949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 775371989 + 775371990.

It is an arithmetic number, because the mean of its divisors is an integer number (775371990).

Almost surely, 2^1550743979 is an apocalyptic number.

1550743979 is a deficient number, since it is larger than the sum of its proper divisors (1).

1550743979 is an equidigital number, since it uses as much as digits as its factorization.

1550743979 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1190700, while the sum is 50.

The square root of 1550743979 is about 39379.4867792865. The cubic root of 1550743979 is about 1157.4796595436.

The spelling of 1550743979 in words is "one billion, five hundred fifty million, seven hundred forty-three thousand, nine hundred seventy-nine".