1551272549 has 2 divisors, whose sum is σ = 1551272550. Its totient is φ = 1551272548.

The previous prime is 1551272453. The next prime is 1551272551. The reversal of 1551272549 is 9452721551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1550941924 + 330625 = 39382^2 + 575^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1551272549 is a prime.

It is a Sophie Germain prime.

Together with 1551272551, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1551272579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 775636274 + 775636275.

It is an arithmetic number, because the mean of its divisors is an integer number (775636275).

Almost surely, 2^1551272549 is an apocalyptic number.

It is an amenable number.

1551272549 is a deficient number, since it is larger than the sum of its proper divisors (1).

1551272549 is an equidigital number, since it uses as much as digits as its factorization.

1551272549 is an evil number, because the sum of its binary digits is even.

The product of its digits is 126000, while the sum is 41.

The square root of 1551272549 is about 39386.1974427591. The cubic root of 1551272549 is about 1157.6111533156.

The spelling of 1551272549 in words is "one billion, five hundred fifty-one million, two hundred seventy-two thousand, five hundred forty-nine".