51001942 has 4 divisors (see below), whose sum is σ = 76502916. Its totient is φ = 25500970.

The previous prime is 51001939. The next prime is 51001963. The reversal of 51001942 is 24910015.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12750484 + ... + 12750487.

It is an arithmetic number, because the mean of its divisors is an integer number (19125729).

Almost surely, 2^51001942 is an apocalyptic number.

51001942 is a deficient number, since it is larger than the sum of its proper divisors (25500974).

51001942 is a wasteful number, since it uses less digits than its factorization.

51001942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25500973.

The product of its (nonzero) digits is 360, while the sum is 22.

The square root of 51001942 is about 7141.5643944447. The cubic root of 51001942 is about 370.8476839065.

Adding to 51001942 its reverse (24910015), we get a palindrome (75911957).

The spelling of 51001942 in words is "fifty-one million, one thousand, nine hundred forty-two".