51536434 has 4 divisors (see below), whose sum is σ = 77304654. Its totient is φ = 25768216.

The previous prime is 51536431. The next prime is 51536437. The reversal of 51536434 is 43463515.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 43463515 = 5 ⋅8692703.

It is an interprime number because it is at equal distance from previous prime (51536431) and next prime (51536437).

It can be written as a sum of positive squares in only one way, i.e., 34751025 + 16785409 = 5895^2 + 4097^2 .

It is a junction number, because it is equal to n+sod(n) for n = 51536396 and 51536405.

It is not an unprimeable number, because it can be changed into a prime (51536431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12884107 + ... + 12884110.

Almost surely, 2^51536434 is an apocalyptic number.

51536434 is a deficient number, since it is larger than the sum of its proper divisors (25768220).

51536434 is a wasteful number, since it uses less digits than its factorization.

51536434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25768219.

The product of its digits is 21600, while the sum is 31.

The square root of 51536434 is about 7178.8880754613. Note that the first 3 decimals coincide. The cubic root of 51536434 is about 372.1386589509.

Adding to 51536434 its reverse (43463515), we get a palindrome (94999949).

The spelling of 51536434 in words is "fifty-one million, five hundred thirty-six thousand, four hundred thirty-four".