51213546 has 20 divisors (see below), whose sum is σ = 114756642. Its totient is φ = 17071128.

The previous prime is 51213523. The next prime is 51213583. The reversal of 51213546 is 64531215.

It can be written as a sum of positive squares in only one way, i.e., 27154521 + 24059025 = 5211^2 + 4905^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 157905 + ... + 158228.

Almost surely, 2^51213546 is an apocalyptic number.

51213546 is an abundant number, since it is smaller than the sum of its proper divisors (63543096).

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

51213546 is a wasteful number, since it uses less digits than its factorization.

51213546 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 316147 (or 316138 counting only the distinct ones).

The product of its digits is 3600, while the sum is 27.

The square root of 51213546 is about 7156.3640209257. The cubic root of 51213546 is about 371.3598511777.

The spelling of 51213546 in words is "fifty-one million, two hundred thirteen thousand, five hundred forty-six".