51551242 has 12 divisors (see below), whose sum is σ = 82143990. Its totient is φ = 24259136.

The previous prime is 51551221. The next prime is 51551243. The reversal of 51551242 is 24215515.

It can be written as a sum of positive squares in 3 ways, for example, as 46117681 + 5433561 = 6791^2 + 2331^2 .

It is not an unprimeable number, because it can be changed into a prime (51551243) 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, 44017 + ... + 45172.

Almost surely, 2^51551242 is an apocalyptic number.

51551242 is a deficient number, since it is larger than the sum of its proper divisors (30592748).

51551242 is a wasteful number, since it uses less digits than its factorization.

51551242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89225 (or 89208 counting only the distinct ones).

The product of its digits is 2000, while the sum is 25.

The square root of 51551242 is about 7179.9193588786. The cubic root of 51551242 is about 372.1742978257.

Adding to 51551242 its reverse (24215515), we get a palindrome (75766757).

The spelling of 51551242 in words is "fifty-one million, five hundred fifty-one thousand, two hundred forty-two".