1550999959 has 2 divisors, whose sum is σ = 1550999960. Its totient is φ = 1550999958.

The previous prime is 1550999941. The next prime is 1550999987. The reversal of 1550999959 is 9599990551.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1550999959 - 2⁵ = 1550999927 is a prime.

It is a super-3 number, since 3×1550999959³ (a number of 29 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1550999897 and 1550999906.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1550999059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 775499979 + 775499980.

It is an arithmetic number, because the mean of its divisors is an integer number (775499980).

Almost surely, 2^1550999959 is an apocalyptic number.

1550999959 is a deficient number, since it is larger than the sum of its proper divisors (1).

1550999959 is an equidigital number, since it uses as much as digits as its factorization.

1550999959 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7381125, while the sum is 61.

The square root of 1550999959 is about 39382.7368144978. The cubic root of 1550999959 is about 1157.5433441032.

The spelling of 1550999959 in words is "one billion, five hundred fifty million, nine hundred ninety-nine thousand, nine hundred fifty-nine".