51954381 has 6 divisors (see below), whose sum is σ = 75045230. Its totient is φ = 34636248.

The previous prime is 51954377. The next prime is 51954389. The reversal of 51954381 is 18345915.

It can be written as a sum of positive squares in only one way, i.e., 47817225 + 4137156 = 6915^2 + 2034^2 .

It is not a de Polignac number, because 51954381 - 2² = 51954377 is a prime.

It is a super-2 number, since 2×51954381² = 5398515410186322, 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 (51954389) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2886346 + ... + 2886363.

Almost surely, 2^51954381 is an apocalyptic number.

It is an amenable number.

51954381 is a deficient number, since it is larger than the sum of its proper divisors (23090849).

51954381 is a wasteful number, since it uses less digits than its factorization.

51954381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5772715 (or 5772712 counting only the distinct ones).

The product of its digits is 21600, while the sum is 36.

The square root of 51954381 is about 7207.9387483524. The cubic root of 51954381 is about 373.1419341152.

The spelling of 51954381 in words is "fifty-one million, nine hundred fifty-four thousand, three hundred eighty-one".