51491436 has 24 divisors (see below), whose sum is σ = 127214640. Its totient is φ = 16154112.

The previous prime is 51491431. The next prime is 51491437. The reversal of 51491436 is 63419415.

It is a junction number, because it is equal to n+sod(n) for n = 51491397 and 51491406.

It is not an unprimeable number, because it can be changed into a prime (51491431) 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, 126001 + ... + 126408.

It is an arithmetic number, because the mean of its divisors is an integer number (5300610).

Almost surely, 2^51491436 is an apocalyptic number.

It is an amenable number.

51491436 is an abundant number, since it is smaller than the sum of its proper divisors (75723204).

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

51491436 is a wasteful number, since it uses less digits than its factorization.

51491436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 252433 (or 252431 counting only the distinct ones).

The product of its digits is 12960, while the sum is 33.

The square root of 51491436 is about 7175.7533402424. The cubic root of 51491436 is about 372.0303189533.

The spelling of 51491436 in words is "fifty-one million, four hundred ninety-one thousand, four hundred thirty-six".