51345442 has 4 divisors (see below), whose sum is σ = 77018166. Its totient is φ = 25672720.

The previous prime is 51345439. The next prime is 51345473. The reversal of 51345442 is 24454315.

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

It can be written as a sum of positive squares in only one way, i.e., 27050401 + 24295041 = 5201^2 + 4929^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 51345442.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12836359 + ... + 12836362.

Almost surely, 2^51345442 is an apocalyptic number.

51345442 is a deficient number, since it is larger than the sum of its proper divisors (25672724).

51345442 is a wasteful number, since it uses less digits than its factorization.

51345442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25672723.

The product of its digits is 9600, while the sum is 28.

The square root of 51345442 is about 7165.5733894783. The cubic root of 51345442 is about 371.6783794718.

Adding to 51345442 its reverse (24454315), we get a palindrome (75799757).

The spelling of 51345442 in words is "fifty-one million, three hundred forty-five thousand, four hundred forty-two".