551694138 has 16 divisors (see below), whose sum is σ = 1108126656. Its totient is φ = 183108320.

The previous prime is 551694107. The next prime is 551694139. The reversal of 551694138 is 831496155.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 551694138.

It is not an unprimeable number, because it can be changed into a prime (551694139) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 195918 + ... + 198713.

It is an arithmetic number, because the mean of its divisors is an integer number (69257916).

Almost surely, 2^551694138 is an apocalyptic number.

551694138 is an abundant number, since it is smaller than the sum of its proper divisors (556432518).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

551694138 is a wasteful number, since it uses less digits than its factorization.

551694138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 394869.

The product of its digits is 129600, while the sum is 42.

The square root of 551694138 is about 23488.1701713863. The cubic root of 551694138 is about 820.1616466968.

The spelling of 551694138 in words is "five hundred fifty-one million, six hundred ninety-four thousand, one hundred thirty-eight".