51601020 has 48 divisors (see below), whose sum is σ = 144805920. Its totient is φ = 13729536.

The previous prime is 51601009. The next prime is 51601021. The reversal of 51601020 is 2010615.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51601021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41934 + ... + 43146.

It is an arithmetic number, because the mean of its divisors is an integer number (3016790).

Almost surely, 2^51601020 is an apocalyptic number.

It is an amenable number.

51601020 is an abundant number, since it is smaller than the sum of its proper divisors (93204900).

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

51601020 is a wasteful number, since it uses less digits than its factorization.

51601020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1934 (or 1932 counting only the distinct ones).

The product of its (nonzero) digits is 60, while the sum is 15.

The square root of 51601020 is about 7183.3849959472. The cubic root of 51601020 is about 372.2940500808.

Adding to 51601020 its reverse (2010615), we get a palindrome (53611635).

The spelling of 51601020 in words is "fifty-one million, six hundred one thousand, twenty".