51311290 has 16 divisors (see below), whose sum is σ = 93530880. Its totient is φ = 20264400.

The previous prime is 51311269. The next prime is 51311291. The reversal of 51311290 is 9211315.

51311290 = 235² + 236² + ... + 550².

It is not an unprimeable number, because it can be changed into a prime (51311291) 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, 31686 + ... + 33265.

It is an arithmetic number, because the mean of its divisors is an integer number (5845680).

Almost surely, 2^51311290 is an apocalyptic number.

51311290 is a deficient number, since it is larger than the sum of its proper divisors (42219590).

51311290 is a wasteful number, since it uses less digits than its factorization.

51311290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65037.

The product of its (nonzero) digits is 270, while the sum is 22.

The square root of 51311290 is about 7163.1899318669. The cubic root of 51311290 is about 371.5959549183.

The spelling of 51311290 in words is "fifty-one million, three hundred eleven thousand, two hundred ninety".