51551650 has 24 divisors (see below), whose sum is σ = 101528100. Its totient is φ = 19407360.

The previous prime is 51551629. The next prime is 51551653. The reversal of 51551650 is 5615515.

It can be written as a sum of positive squares in 6 ways, for example, as 37466641 + 14085009 = 6121^2 + 3753^2 .

It is not an unprimeable number, because it can be changed into a prime (51551653) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 29475 + ... + 31174.

Almost surely, 2^51551650 is an apocalyptic number.

51551650 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

51551650 is a deficient number, since it is larger than the sum of its proper divisors (49976450).

51551650 is a wasteful number, since it uses less digits than its factorization.

51551650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60678 (or 60673 counting only the distinct ones).

The product of its (nonzero) digits is 3750, while the sum is 28.

The square root of 51551650 is about 7179.9477713978. The cubic root of 51551650 is about 372.1752796754.

It can be divided in two parts, 5155 and 1650, that multiplied together give a triangular number (8505750 = T₄₁₂₄).

The spelling of 51551650 in words is "fifty-one million, five hundred fifty-one thousand, six hundred fifty".