51120646 has 4 divisors (see below), whose sum is σ = 76680972. Its totient is φ = 25560322.

The previous prime is 51120617. The next prime is 51120647. The reversal of 51120646 is 64602115.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×51120646² = 5226640894914632, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 51120646.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51120647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12780160 + ... + 12780163.

It is an arithmetic number, because the mean of its divisors is an integer number (19170243).

Almost surely, 2^51120646 is an apocalyptic number.

51120646 is a deficient number, since it is larger than the sum of its proper divisors (25560326).

51120646 is a wasteful number, since it uses less digits than its factorization.

51120646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25560325.

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

The square root of 51120646 is about 7149.8703484749. The cubic root of 51120646 is about 371.1351696614.

The spelling of 51120646 in words is "fifty-one million, one hundred twenty thousand, six hundred forty-six".