51131740 has 24 divisors (see below), whose sum is σ = 117138672. Its totient is φ = 18593280.

The previous prime is 51131719. The next prime is 51131747. The reversal of 51131740 is 4713115.

It is a super-2 number, since 2×51131740² = 5228909670855200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51131747) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 115989 + ... + 116428.

It is an arithmetic number, because the mean of its divisors is an integer number (4880778).

Almost surely, 2^51131740 is an apocalyptic number.

It is an amenable number.

51131740 is an abundant number, since it is smaller than the sum of its proper divisors (66006932).

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

51131740 is a wasteful number, since it uses less digits than its factorization.

51131740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 232437 (or 232435 counting only the distinct ones).

The product of its (nonzero) digits is 420, while the sum is 22.

The square root of 51131740 is about 7150.6461246520. The cubic root of 51131740 is about 371.1620151474.

Adding to 51131740 its reverse (4713115), we get a palindrome (55844855).

The spelling of 51131740 in words is "fifty-one million, one hundred thirty-one thousand, seven hundred forty".