51861310 has 16 divisors (see below), whose sum is σ = 95627952. Its totient is φ = 20238400.

The previous prime is 51861289. The next prime is 51861319. The reversal of 51861310 is 1316815.

It is a super-2 number, since 2×51861310² = 5379190949832200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51861319) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62836 + ... + 63655.

It is an arithmetic number, because the mean of its divisors is an integer number (5976747).

Almost surely, 2^51861310 is an apocalyptic number.

51861310 is a deficient number, since it is larger than the sum of its proper divisors (43766642).

51861310 is a wasteful number, since it uses less digits than its factorization.

51861310 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126539.

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 51861310 is about 7201.4797090598. The cubic root of 51861310 is about 372.9189856324.

The spelling of 51861310 in words is "fifty-one million, eight hundred sixty-one thousand, three hundred ten".