51120901 has 4 divisors (see below), whose sum is σ = 55053292. Its totient is φ = 47188512.

The previous prime is 51120893. The next prime is 51120931. The reversal of 51120901 is 10902115.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 20484676 + 30636225 = 4526^2 + 5535^2 .

It is a cyclic number.

It is not a de Polignac number, because 51120901 - 2³ = 51120893 is a prime.

It is a super-2 number, since 2×51120901² = 5226693038103602, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51120931) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1966176 + ... + 1966201.

It is an arithmetic number, because the mean of its divisors is an integer number (13763323).

Almost surely, 2^51120901 is an apocalyptic number.

It is an amenable number.

51120901 is a deficient number, since it is larger than the sum of its proper divisors (3932391).

51120901 is a wasteful number, since it uses less digits than its factorization.

51120901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3932390.

The product of its (nonzero) digits is 90, while the sum is 19.

The square root of 51120901 is about 7149.8881809438. Note that the first 3 decimals coincide. The cubic root of 51120901 is about 371.1357867592.

It can be divided in two parts, 511 and 20901, that added together give a palindrome (21412).

The spelling of 51120901 in words is "fifty-one million, one hundred twenty thousand, nine hundred one".