51499442 has 4 divisors (see below), whose sum is σ = 77249166. Its totient is φ = 25749720.

The previous prime is 51499429. The next prime is 51499457. The reversal of 51499442 is 24499415.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24499415 = 5 ⋅4899883.

It can be written as a sum of positive squares in only one way, i.e., 29041321 + 22458121 = 5389^2 + 4739^2 .

It is a super-2 number, since 2×51499442² = 5304385052622728, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 51499396 and 51499405.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12874859 + ... + 12874862.

Almost surely, 2^51499442 is an apocalyptic number.

51499442 is a deficient number, since it is larger than the sum of its proper divisors (25749724).

51499442 is a wasteful number, since it uses less digits than its factorization.

51499442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25749723.

The product of its digits is 51840, while the sum is 38.

The square root of 51499442 is about 7176.3111693962. The cubic root of 51499442 is about 372.0495993140.

The spelling of 51499442 in words is "fifty-one million, four hundred ninety-nine thousand, four hundred forty-two".