1551511001 has 4 divisors (see below), whose sum is σ = 1642776372. Its totient is φ = 1460245632.

The previous prime is 1551510979. The next prime is 1551511019. The reversal of 1551511001 is 1001151551.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1447878601 + 103632400 = 38051^2 + 10180^2 .

It is a cyclic number.

It is not a de Polignac number, because 1551511001 - 2¹⁰ = 1551509977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1551511051) 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, 45632660 + ... + 45632693.

It is an arithmetic number, because the mean of its divisors is an integer number (410694093).

Almost surely, 2^1551511001 is an apocalyptic number.

It is an amenable number.

1551511001 is a deficient number, since it is larger than the sum of its proper divisors (91265371).

1551511001 is an equidigital number, since it uses as much as digits as its factorization.

1551511001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91265370.

The product of its (nonzero) digits is 125, while the sum is 20.

The square root of 1551511001 is about 39389.2244275005. The cubic root of 1551511001 is about 1157.6704638802.

Adding to 1551511001 its reverse (1001151551), we get a palindrome (2552662552).

The spelling of 1551511001 in words is "one billion, five hundred fifty-one million, five hundred eleven thousand, one".