51641645 has 8 divisors (see below), whose sum is σ = 67603680. Its totient is φ = 37557520.

The previous prime is 51641633. The next prime is 51641659. The reversal of 51641645 is 54614615.

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

It is not a de Polignac number, because 51641645 - 2¹⁰ = 51640621 is a prime.

It is a super-3 number, since 3×51641645³ (a number of 24 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 469415 + ... + 469524.

It is an arithmetic number, because the mean of its divisors is an integer number (8450460).

Almost surely, 2^51641645 is an apocalyptic number.

51641645 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

51641645 is a deficient number, since it is larger than the sum of its proper divisors (15962035).

51641645 is a wasteful number, since it uses less digits than its factorization.

51641645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 938955.

The product of its digits is 14400, while the sum is 32.

The square root of 51641645 is about 7186.2121454908. The cubic root of 51641645 is about 372.3917256591.

It can be divided in two parts, 5 and 1641645, that multiplied together give a square (8208225 = 2865²).

The spelling of 51641645 in words is "fifty-one million, six hundred forty-one thousand, six hundred forty-five".