51271590 has 64 divisors (see below), whose sum is σ = 127008000. Its totient is φ = 13240704.

The previous prime is 51271589. The next prime is 51271621. The reversal of 51271590 is 9517215.

It is a super-2 number, since 2×51271590² = 5257551882256200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 146736 + ... + 147084.

It is an arithmetic number, because the mean of its divisors is an integer number (1984500).

Almost surely, 2^51271590 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51271590, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (63504000).

51271590 is an abundant number, since it is smaller than the sum of its proper divisors (75736410).

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

51271590 is a wasteful number, since it uses less digits than its factorization.

51271590 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 501.

The product of its (nonzero) digits is 3150, while the sum is 30.

The square root of 51271590 is about 7160.4182838714. The cubic root of 51271590 is about 371.5000944964.

The spelling of 51271590 in words is "fifty-one million, two hundred seventy-one thousand, five hundred ninety".