551954918 has 4 divisors (see below), whose sum is σ = 827932380. Its totient is φ = 275977458.

The previous prime is 551954917. The next prime is 551954933. The reversal of 551954918 is 819459155.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 819459155 = 5 ⋅163891831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (551954917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 137988728 + ... + 137988731.

It is an arithmetic number, because the mean of its divisors is an integer number (206983095).

Almost surely, 2^551954918 is an apocalyptic number.

551954918 is a deficient number, since it is larger than the sum of its proper divisors (275977462).

551954918 is a wasteful number, since it uses less digits than its factorization.

551954918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275977461.

The product of its digits is 324000, while the sum is 47.

The square root of 551954918 is about 23493.7208206789. The cubic root of 551954918 is about 820.2908535939.

The spelling of 551954918 in words is "five hundred fifty-one million, nine hundred fifty-four thousand, nine hundred eighteen".