51121356 has 96 divisors (see below), whose sum is σ = 144807936. Its totient is φ = 13838400.

The previous prime is 51121339. The next prime is 51121361. The reversal of 51121356 is 65312115.

It is a super-2 number, since 2×51121356² = 5226786078557472, which contains 22 as substring.

Its product of digits (900) is a multiple of the sum of its prime divisors (60).

It is a zygodrome in base 2.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1649061 + ... + 1649091.

It is an arithmetic number, because the mean of its divisors is an integer number (1508416).

Almost surely, 2^51121356 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51121356, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (72403968).

51121356 is an abundant number, since it is smaller than the sum of its proper divisors (93686580).

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

51121356 is a wasteful number, since it uses less digits than its factorization.

51121356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124 (or 60 counting only the distinct ones).

The product of its digits is 900, while the sum is 24.

The square root of 51121356 is about 7149.9199995524. The cubic root of 51121356 is about 371.1368878501.

The spelling of 51121356 in words is "fifty-one million, one hundred twenty-one thousand, three hundred fifty-six".