51821254 has 16 divisors (see below), whose sum is σ = 81326592. Its totient is φ = 24718408.

The previous prime is 51821239. The next prime is 51821309. The reversal of 51821254 is 45212815.

It is a super-2 number, since 2×51821254² = 5370884732265032, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19107 + ... + 21649.

It is an arithmetic number, because the mean of its divisors is an integer number (5082912).

Almost surely, 2^51821254 is an apocalyptic number.

51821254 is a deficient number, since it is larger than the sum of its proper divisors (29505338).

51821254 is a wasteful number, since it uses less digits than its factorization.

51821254 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3011.

The product of its digits is 3200, while the sum is 28.

The square root of 51821254 is about 7198.6980767358. The cubic root of 51821254 is about 372.8229507121.

The spelling of 51821254 in words is "fifty-one million, eight hundred twenty-one thousand, two hundred fifty-four".