551545493 has 2 divisors, whose sum is σ = 551545494. Its totient is φ = 551545492.

The previous prime is 551545487. The next prime is 551545523. The reversal of 551545493 is 394545155.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 509269489 + 42276004 = 22567^2 + 6502^2 .

It is a cyclic number.

It is not a de Polignac number, because 551545493 - 2²⁶ = 484436629 is a prime.

It is a super-2 number, since 2×551545493² = 608404861697226098, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 551545493.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (551542493) 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, 275772746 + 275772747.

It is an arithmetic number, because the mean of its divisors is an integer number (275772747).

Almost surely, 2^551545493 is an apocalyptic number.

It is an amenable number.

551545493 is a deficient number, since it is larger than the sum of its proper divisors (1).

551545493 is an equidigital number, since it uses as much as digits as its factorization.

551545493 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 270000, while the sum is 41.

The square root of 551545493 is about 23485.0057057689. The cubic root of 551545493 is about 820.0879803478.

The spelling of 551545493 in words is "five hundred fifty-one million, five hundred forty-five thousand, four hundred ninety-three".