51642106 has 4 divisors (see below), whose sum is σ = 77463162. Its totient is φ = 25821052.

The previous prime is 51642091. The next prime is 51642109. The reversal of 51642106 is 60124615.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 60124615 = 5 ⋅12024923.

It can be written as a sum of positive squares in only one way, i.e., 27720225 + 23921881 = 5265^2 + 4891^2 .

It is a super-2 number, since 2×51642106² = 5333814224230472, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51642109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12910525 + ... + 12910528.

Almost surely, 2^51642106 is an apocalyptic number.

51642106 is a deficient number, since it is larger than the sum of its proper divisors (25821056).

51642106 is a wasteful number, since it uses less digits than its factorization.

51642106 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25821055.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 51642106 is about 7186.2442207317. The cubic root of 51642106 is about 372.3928337575.

The spelling of 51642106 in words is "fifty-one million, six hundred forty-two thousand, one hundred six".