1551553247 has 2 divisors, whose sum is σ = 1551553248. Its totient is φ = 1551553246.

The previous prime is 1551553189. The next prime is 1551553249. The reversal of 1551553247 is 7423551551.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1551553247 is a prime.

Together with 1551553249, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1551553247.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1551553249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 775776623 + 775776624.

It is an arithmetic number, because the mean of its divisors is an integer number (775776624).

Almost surely, 2^1551553247 is an apocalyptic number.

1551553247 is a deficient number, since it is larger than the sum of its proper divisors (1).

1551553247 is an equidigital number, since it uses as much as digits as its factorization.

1551553247 is an evil number, because the sum of its binary digits is even.

The product of its digits is 105000, while the sum is 38.

The square root of 1551553247 is about 39389.7606872649. The cubic root of 1551553247 is about 1157.6809711647.

The spelling of 1551553247 in words is "one billion, five hundred fifty-one million, five hundred fifty-three thousand, two hundred forty-seven".