51149643 has 4 divisors (see below), whose sum is σ = 68199528. Its totient is φ = 34099760.

The previous prime is 51149639. The next prime is 51149687. The reversal of 51149643 is 34694115.

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

It is a cyclic number.

It is not a de Polignac number, because 51149643 - 2² = 51149639 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51149633) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8524938 + ... + 8524943.

It is an arithmetic number, because the mean of its divisors is an integer number (17049882).

Almost surely, 2^51149643 is an apocalyptic number.

51149643 is a deficient number, since it is larger than the sum of its proper divisors (17049885).

51149643 is a wasteful number, since it uses less digits than its factorization.

51149643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17049884.

The product of its digits is 12960, while the sum is 33.

The square root of 51149643 is about 7151.8978600089. The cubic root of 51149643 is about 371.2053290014.

The spelling of 51149643 in words is "fifty-one million, one hundred forty-nine thousand, six hundred forty-three".