51111649 has 8 divisors (see below), whose sum is σ = 52934112. Its totient is φ = 49318080.

The previous prime is 51111637. The next prime is 51111661. The reversal of 51111649 is 94611115.

It is an interprime number because it is at equal distance from previous prime (51111637) and next prime (51111661).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51111649 - 2⁵ = 51111617 is a prime.

It is a super-2 number, since 2×51111649² = 5224801326998402, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51111629) 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, 3592 + ... + 10729.

It is an arithmetic number, because the mean of its divisors is an integer number (6616764).

Almost surely, 2^51111649 is an apocalyptic number.

It is an amenable number.

51111649 is a deficient number, since it is larger than the sum of its proper divisors (1822463).

51111649 is a wasteful number, since it uses less digits than its factorization.

51111649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14447.

The product of its digits is 1080, while the sum is 28.

The square root of 51111649 is about 7149.2411485416. The cubic root of 51111649 is about 371.1133956862.

The spelling of 51111649 in words is "fifty-one million, one hundred eleven thousand, six hundred forty-nine".