51165406 has 4 divisors (see below), whose sum is σ = 76748112. Its totient is φ = 25582702.

The previous prime is 51165391. The next prime is 51165467. The reversal of 51165406 is 60456115.

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

It is a super-2 number, since 2×51165406² = 5235797542289672, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12791350 + ... + 12791353.

It is an arithmetic number, because the mean of its divisors is an integer number (19187028).

Almost surely, 2^51165406 is an apocalyptic number.

51165406 is a deficient number, since it is larger than the sum of its proper divisors (25582706).

51165406 is a wasteful number, since it uses less digits than its factorization.

51165406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25582705.

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 51165406 is about 7152.9997902978. Note that the first 3 decimals coincide. The cubic root of 51165406 is about 371.2434570527.

The spelling of 51165406 in words is "fifty-one million, one hundred sixty-five thousand, four hundred six".