51155405 has 8 divisors (see below), whose sum is σ = 70156032. Its totient is φ = 35077968.

The previous prime is 51155387. The next prime is 51155443. The reversal of 51155405 is 50455115.

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 51155405 - 2¹⁴ = 51139021 is a prime.

It is a Duffinian number.

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, 730757 + ... + 730826.

It is an arithmetic number, because the mean of its divisors is an integer number (8769504).

Almost surely, 2^51155405 is an apocalyptic number.

It is an amenable number.

51155405 is a deficient number, since it is larger than the sum of its proper divisors (19000627).

51155405 is a wasteful number, since it uses less digits than its factorization.

51155405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1461595.

The product of its (nonzero) digits is 2500, while the sum is 26.

The square root of 51155405 is about 7152.3006788026. The cubic root of 51155405 is about 371.2192672206.

The spelling of 51155405 in words is "fifty-one million, one hundred fifty-five thousand, four hundred five".