1002011551 has 4 divisors (see below), whose sum is σ = 1002481704. Its totient is φ = 1001541400.

The previous prime is 1002011539. The next prime is 1002011579. The reversal of 1002011551 is 1551102001.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1002011551 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 (1002011581) 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, 231865 + ... + 236146.

It is an arithmetic number, because the mean of its divisors is an integer number (250620426).

Almost surely, 2^1002011551 is an apocalyptic number.

1002011551 is a deficient number, since it is larger than the sum of its proper divisors (470153).

1002011551 is an equidigital number, since it uses as much as digits as its factorization.

1002011551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 470152.

The product of its (nonzero) digits is 50, while the sum is 16.

The square root of 1002011551 is about 31654.5660371454. The cubic root of 1002011551 is about 1000.6700679087.

Adding to 1002011551 its reverse (1551102001), we get a palindrome (2553113552).

The spelling of 1002011551 in words is "one billion, two million, eleven thousand, five hundred fifty-one".