51961020 has 48 divisors (see below), whose sum is σ = 147886368. Its totient is φ = 13628160.

The previous prime is 51961009. The next prime is 51961033. The reversal of 51961020 is 2016915.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3439 + ... + 10758.

It is an arithmetic number, because the mean of its divisors is an integer number (3080966).

Almost surely, 2^51961020 is an apocalyptic number.

It is an amenable number.

51961020 is an abundant number, since it is smaller than the sum of its proper divisors (95925348).

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

51961020 is a wasteful number, since it uses less digits than its factorization.

51961020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14270 (or 14268 counting only the distinct ones).

The product of its (nonzero) digits is 540, while the sum is 24.

The square root of 51961020 is about 7208.3992675212. The cubic root of 51961020 is about 373.1578274415.

Adding to 51961020 its reverse (2016915), we get a palindrome (53977935).

It can be divided in two parts, 5196 and 1020, that added together give a triangular number (6216 = T₁₁₁).

The spelling of 51961020 in words is "fifty-one million, nine hundred sixty-one thousand, twenty".