51550554 has 16 divisors (see below), whose sum is σ = 112474080. Its totient is φ = 15621360.

The previous prime is 51550549. The next prime is 51550559. The reversal of 51550554 is 45505515.

It is an interprime number because it is at equal distance from previous prime (51550549) and next prime (51550559).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (51550559) 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, 390469 + ... + 390600.

It is an arithmetic number, because the mean of its divisors is an integer number (7029630).

Almost surely, 2^51550554 is an apocalyptic number.

51550554 is an abundant number, since it is smaller than the sum of its proper divisors (60923526).

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

51550554 is a wasteful number, since it uses less digits than its factorization.

51550554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 781085.

The product of its (nonzero) digits is 12500, while the sum is 30.

The square root of 51550554 is about 7179.8714473171. The cubic root of 51550554 is about 372.1726421458.

The spelling of 51550554 in words is "fifty-one million, five hundred fifty thousand, five hundred fifty-four".