51810822 has 24 divisors (see below), whose sum is σ = 128293776. Its totient is φ = 14803056.

The previous prime is 51810821. The next prime is 51810823. The reversal of 51810822 is 22801815.

It is an interprime number because it is at equal distance from previous prime (51810821) and next prime (51810823).

It is a super-2 number, since 2×51810822² = 5368722552631368, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51810821) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 205473 + ... + 205724.

It is an arithmetic number, because the mean of its divisors is an integer number (5345574).

Almost surely, 2^51810822 is an apocalyptic number.

51810822 is an abundant number, since it is smaller than the sum of its proper divisors (76482954).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51810822 is a wasteful number, since it uses less digits than its factorization.

51810822 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 411212 (or 411209 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 27.

The square root of 51810822 is about 7197.9734648024. The cubic root of 51810822 is about 372.7979316981.

The spelling of 51810822 in words is "fifty-one million, eight hundred ten thousand, eight hundred twenty-two".