1550551001 has 4 divisors (see below), whose sum is σ = 1562760192. Its totient is φ = 1538341812.

The previous prime is 1550550923. The next prime is 1550551063. The reversal of 1550551001 is 1001550551.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1001550551 = 263 ⋅3808177.

It is a cyclic number.

It is not a de Polignac number, because 1550551001 - 2¹⁰ = 1550549977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1550551081) 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, 6104405 + ... + 6104658.

It is an arithmetic number, because the mean of its divisors is an integer number (390690048).

Almost surely, 2^1550551001 is an apocalyptic number.

It is an amenable number.

1550551001 is a deficient number, since it is larger than the sum of its proper divisors (12209191).

1550551001 is a wasteful number, since it uses less digits than its factorization.

1550551001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12209190.

The product of its (nonzero) digits is 625, while the sum is 23.

The square root of 1550551001 is about 39377.0364679720. The cubic root of 1550551001 is about 1157.4316444449.

The spelling of 1550551001 in words is "one billion, five hundred fifty million, five hundred fifty-one thousand, one".