51540154 has 4 divisors (see below), whose sum is σ = 77310234. Its totient is φ = 25770076.

The previous prime is 51540121. The next prime is 51540161. The reversal of 51540154 is 45104515.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 46580625 + 4959529 = 6825^2 + 2227^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12885037 + ... + 12885040.

Almost surely, 2^51540154 is an apocalyptic number.

51540154 is a deficient number, since it is larger than the sum of its proper divisors (25770080).

51540154 is a wasteful number, since it uses less digits than its factorization.

51540154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25770079.

The product of its (nonzero) digits is 2000, while the sum is 25.

The square root of 51540154 is about 7179.1471638350. The cubic root of 51540154 is about 372.1476126328.

Adding to 51540154 its reverse (45104515), we get a palindrome (96644669).

The spelling of 51540154 in words is "fifty-one million, five hundred forty thousand, one hundred fifty-four".