1550900001 has 8 divisors (see below), whose sum is σ = 2363276224. Its totient is φ = 886228560.

The previous prime is 1550899991. The next prime is 1550900017. The reversal of 1550900001 is 1000090551.

It is a happy number.

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

It is not a de Polignac number, because 1550900001 - 2⁷ = 1550899873 is a prime.

It is a super-3 number, since 3×1550900001³ (a number of 29 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 73852381 = 1550900001 / (1 + 5 + 5 + 0 + 9 + 0 + 0 + 0 + 0 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1550900801) 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, 36926170 + ... + 36926211.

It is an arithmetic number, because the mean of its divisors is an integer number (295409528).

Almost surely, 2^1550900001 is an apocalyptic number.

It is an amenable number.

1550900001 is a deficient number, since it is larger than the sum of its proper divisors (812376223).

1550900001 is an equidigital number, since it uses as much as digits as its factorization.

1550900001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73852391.

The product of its (nonzero) digits is 225, while the sum is 21.

The square root of 1550900001 is about 39381.4677354717. The cubic root of 1550900001 is about 1157.5184766615.

Adding to 1550900001 its reverse (1000090551), we get a palindrome (2550990552).

The spelling of 1550900001 in words is "one billion, five hundred fifty million, nine hundred thousand, one".