51123135 has 32 divisors (see below), whose sum is σ = 97551360. Its totient is φ = 22353408.

The previous prime is 51123119. The next prime is 51123151. The reversal of 51123135 is 53132115.

It is an interprime number because it is at equal distance from previous prime (51123119) and next prime (51123151).

It is not a de Polignac number, because 51123135 - 2⁴ = 51123119 is a prime.

It is a super-2 number, since 2×51123135² = 5227149864456450, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8170 + ... + 12999.

It is an arithmetic number, because the mean of its divisors is an integer number (3048480).

Almost surely, 2^51123135 is an apocalyptic number.

51123135 is a deficient number, since it is larger than the sum of its proper divisors (46428225).

51123135 is a wasteful number, since it uses less digits than its factorization.

51123135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21207.

The product of its digits is 450, while the sum is 21.

The square root of 51123135 is about 7150.0444054565. The cubic root of 51123135 is about 371.1411929319.

The spelling of 51123135 in words is "fifty-one million, one hundred twenty-three thousand, one hundred thirty-five".