51155408 has 20 divisors (see below), whose sum is σ = 99691908. Its totient is φ = 25428480.

The previous prime is 51155387. The next prime is 51155443. The reversal of 51155408 is 80455115.

It can be written as a sum of positive squares in 2 ways, for example, as 47499664 + 3655744 = 6892^2 + 1912^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6473 + ... + 12008.

Almost surely, 2^51155408 is an apocalyptic number.

It is an amenable number.

51155408 is a deficient number, since it is larger than the sum of its proper divisors (48536500).

51155408 is a wasteful number, since it uses less digits than its factorization.

51155408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18662 (or 18656 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 29.

The square root of 51155408 is about 7152.3008885253. The cubic root of 51155408 is about 371.2192744773.

The spelling of 51155408 in words is "fifty-one million, one hundred fifty-five thousand, four hundred eight".