51971342 has 4 divisors (see below), whose sum is σ = 77957016. Its totient is φ = 25985670.

The previous prime is 51971341. The next prime is 51971351. The reversal of 51971342 is 24317915.

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

It is a junction number, because it is equal to n+sod(n) for n = 51971299 and 51971308.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51971341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12992834 + ... + 12992837.

It is an arithmetic number, because the mean of its divisors is an integer number (19489254).

Almost surely, 2^51971342 is an apocalyptic number.

51971342 is a deficient number, since it is larger than the sum of its proper divisors (25985674).

51971342 is a wasteful number, since it uses less digits than its factorization.

51971342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25985673.

The product of its digits is 7560, while the sum is 32.

The square root of 51971342 is about 7209.1152022977. The cubic root of 51971342 is about 373.1825349375.

The spelling of 51971342 in words is "fifty-one million, nine hundred seventy-one thousand, three hundred forty-two".