51691348 has 6 divisors (see below), whose sum is σ = 90459866. Its totient is φ = 25845672.

The previous prime is 51691319. The next prime is 51691349. The reversal of 51691348 is 84319615.

51691348 is nontrivially palindromic in base 3.

It can be written as a sum of positive squares in only one way, i.e., 51581124 + 110224 = 7182^2 + 332^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51691349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6461415 + ... + 6461422.

Almost surely, 2^51691348 is an apocalyptic number.

It is an amenable number.

51691348 is a deficient number, since it is larger than the sum of its proper divisors (38768518).

51691348 is a wasteful number, since it uses less digits than its factorization.

51691348 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12922841 (or 12922839 counting only the distinct ones).

The product of its digits is 25920, while the sum is 37.

The square root of 51691348 is about 7189.6695334348. The cubic root of 51691348 is about 372.5111580220.

It can be divided in two parts, 516913 and 48, that added together give a square (516961 = 719²).

The spelling of 51691348 in words is "fifty-one million, six hundred ninety-one thousand, three hundred forty-eight".