51451554 has 64 divisors (see below), whose sum is σ = 135862272. Its totient is φ = 12576000.

The previous prime is 51451549. The next prime is 51451559. The reversal of 51451554 is 45515415.

It is an interprime number because it is at equal distance from previous prime (51451549) and next prime (51451559).

It is not an unprimeable number, because it can be changed into a prime (51451559) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4579 + ... + 11129.

It is an arithmetic number, because the mean of its divisors is an integer number (2122848).

Almost surely, 2^51451554 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51451554, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (67931136).

51451554 is an abundant number, since it is smaller than the sum of its proper divisors (84410718).

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

51451554 is a wasteful number, since it uses less digits than its factorization.

51451554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6591.

The product of its digits is 10000, while the sum is 30.

The square root of 51451554 is about 7172.9738602619. The cubic root of 51451554 is about 371.9342437826.

Adding to 51451554 its reverse (45515415), we get a palindrome (96966969).

The spelling of 51451554 in words is "fifty-one million, four hundred fifty-one thousand, five hundred fifty-four".