51223155 has 8 divisors (see below), whose sum is σ = 81957072. Its totient is φ = 27319008.

The previous prime is 51223127. The next prime is 51223189. The reversal of 51223155 is 55132215.

It is a happy number.

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

It is not a de Polignac number, because 51223155 - 2⁷ = 51223027 is a prime.

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, 1707424 + ... + 1707453.

It is an arithmetic number, because the mean of its divisors is an integer number (10244634).

Almost surely, 2^51223155 is an apocalyptic number.

51223155 is a deficient number, since it is larger than the sum of its proper divisors (30733917).

51223155 is a wasteful number, since it uses less digits than its factorization.

51223155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3414885.

The product of its digits is 1500, while the sum is 24.

The square root of 51223155 is about 7157.0353499197. The cubic root of 51223155 is about 371.3830753305.

The spelling of 51223155 in words is "fifty-one million, two hundred twenty-three thousand, one hundred fifty-five".