551057491 has 2 divisors, whose sum is σ = 551057492. Its totient is φ = 551057490.

The previous prime is 551057489. The next prime is 551057527. The reversal of 551057491 is 194750155.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 551057491 - 2¹ = 551057489 is a prime.

Together with 551057489, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 551057491.

It is not a weakly prime, because it can be changed into another prime (551007491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 275528745 + 275528746.

It is an arithmetic number, because the mean of its divisors is an integer number (275528746).

Almost surely, 2^551057491 is an apocalyptic number.

551057491 is a deficient number, since it is larger than the sum of its proper divisors (1).

551057491 is an equidigital number, since it uses as much as digits as its factorization.

551057491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31500, while the sum is 37.

The square root of 551057491 is about 23474.6137561409. The cubic root of 551057491 is about 819.8460403990.

It can be divided in two parts, 5510 and 57491, that added together give a square (63001 = 251²).

The spelling of 551057491 in words is "five hundred fifty-one million, fifty-seven thousand, four hundred ninety-one".