1551071201 has 4 divisors (see below), whose sum is σ = 1551150000. Its totient is φ = 1550992404.

The previous prime is 1551071161. The next prime is 1551071209. The reversal of 1551071201 is 1021701551.

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 a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1021701551 = 13 ⋅78592427.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1551071201 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1551071209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18050 + ... + 58548.

It is an arithmetic number, because the mean of its divisors is an integer number (387787500).

Almost surely, 2^1551071201 is an apocalyptic number.

It is an amenable number.

1551071201 is a deficient number, since it is larger than the sum of its proper divisors (78799).

1551071201 is an equidigital number, since it uses as much as digits as its factorization.

1551071201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78798.

The product of its (nonzero) digits is 350, while the sum is 23.

The square root of 1551071201 is about 39383.6412867068. The cubic root of 1551071201 is about 1157.5610669578.

Adding to 1551071201 its reverse (1021701551), we get a palindrome (2572772752).

The spelling of 1551071201 in words is "one billion, five hundred fifty-one million, seventy-one thousand, two hundred one".