1550990551 has 8 divisors (see below), whose sum is σ = 1696842000. Its totient is φ = 1405947840.

The previous prime is 1550990549. The next prime is 1550990591.

1550990551 is nontrivially palindromic in base 10.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1550990551 - 2¹ = 1550990549 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 (1550990591) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 198166 + ... + 205843.

It is an arithmetic number, because the mean of its divisors is an integer number (212105250).

Almost surely, 2^1550990551 is an apocalyptic number.

1550990551 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1550990551 is a deficient number, since it is larger than the sum of its proper divisors (145851449).

1550990551 is a wasteful number, since it uses less digits than its factorization.

1550990551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 404369.

The product of its (nonzero) digits is 50625, while the sum is 40.

The square root of 1550990551 is about 39382.6173711195. The cubic root of 1550990551 is about 1157.5410036368.

The spelling of 1550990551 in words is "one billion, five hundred fifty million, nine hundred ninety thousand, five hundred fifty-one".