1201001551 has 2 divisors, whose sum is σ = 1201001552. Its totient is φ = 1201001550.

The previous prime is 1201001539. The next prime is 1201001573. The reversal of 1201001551 is 1551001021.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1201001551 - 2⁵ = 1201001519 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1201001591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600500775 + 600500776.

It is an arithmetic number, because the mean of its divisors is an integer number (600500776).

Almost surely, 2^1201001551 is an apocalyptic number.

1201001551 is a deficient number, since it is larger than the sum of its proper divisors (1).

1201001551 is an equidigital number, since it uses as much as digits as its factorization.

1201001551 is an odious number, because the sum of its binary digits is odd.

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

The square root of 1201001551 is about 34655.4692797544. The cubic root of 1201001551 is about 1062.9541277355.

Adding to 1201001551 its reverse (1551001021), we get a palindrome (2752002572).

The spelling of 1201001551 in words is "one billion, two hundred one million, one thousand, five hundred fifty-one".