551043946 has 4 divisors (see below), whose sum is σ = 826565922. Its totient is φ = 275521972.

The previous prime is 551043937. The next prime is 551043949. The reversal of 551043946 is 649340155.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 649340155 = 5 ⋅129868031.

It can be written as a sum of positive squares in only one way, i.e., 437855625 + 113188321 = 20925^2 + 10639^2 .

It is not an unprimeable number, because it can be changed into a prime (551043949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 137760985 + ... + 137760988.

Almost surely, 2^551043946 is an apocalyptic number.

551043946 is a deficient number, since it is larger than the sum of its proper divisors (275521976).

551043946 is a wasteful number, since it uses less digits than its factorization.

551043946 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275521975.

The product of its (nonzero) digits is 64800, while the sum is 37.

The square root of 551043946 is about 23474.3252512186. The cubic root of 551043946 is about 819.8393230687.

The spelling of 551043946 in words is "five hundred fifty-one million, forty-three thousand, nine hundred forty-six".