51370164 has 18 divisors (see below), whose sum is σ = 129852450. Its totient is φ = 17123376.

The previous prime is 51370159. The next prime is 51370169. The reversal of 51370164 is 46107315.

It is an interprime number because it is at equal distance from previous prime (51370159) and next prime (51370169).

It can be written as a sum of positive squares in only one way, i.e., 37307664 + 14062500 = 6108^2 + 3750^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51370169) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 713439 + ... + 713510.

It is an arithmetic number, because the mean of its divisors is an integer number (7214025).

Almost surely, 2^51370164 is an apocalyptic number.

It is an amenable number.

51370164 is an abundant number, since it is smaller than the sum of its proper divisors (78482286).

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

51370164 is a wasteful number, since it uses less digits than its factorization.

51370164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1426959 (or 1426954 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 27.

The square root of 51370164 is about 7167.2982357371. The cubic root of 51370164 is about 371.7380222769.

Adding to 51370164 its reverse (46107315), we get a palindrome (97477479).

The spelling of 51370164 in words is "fifty-one million, three hundred seventy thousand, one hundred sixty-four".