551878949 has 2 divisors, whose sum is σ = 551878950. Its totient is φ = 551878948.

The previous prime is 551878927. The next prime is 551878991. The reversal of 551878949 is 949878155.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 508186849 + 43692100 = 22543^2 + 6610^2 .

It is a cyclic number.

It is not a de Polignac number, because 551878949 - 2¹² = 551874853 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 551878894 and 551878903.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (551878049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 275939474 + 275939475.

It is an arithmetic number, because the mean of its divisors is an integer number (275939475).

Almost surely, 2^551878949 is an apocalyptic number.

It is an amenable number.

551878949 is a deficient number, since it is larger than the sum of its proper divisors (1).

551878949 is an equidigital number, since it uses as much as digits as its factorization.

551878949 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3628800, while the sum is 56.

The square root of 551878949 is about 23492.1039713347. The cubic root of 551878949 is about 820.2532179507.

The spelling of 551878949 in words is "five hundred fifty-one million, eight hundred seventy-eight thousand, nine hundred forty-nine".