51161551 has 8 divisors (see below), whose sum is σ = 61909920. Its totient is φ = 41273088.

The previous prime is 51161543. The next prime is 51161557. The reversal of 51161551 is 15516115.

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 51161551 - 2³ = 51161543 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51161557) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 214846 + ... + 215083.

It is an arithmetic number, because the mean of its divisors is an integer number (7738740).

Almost surely, 2^51161551 is an apocalyptic number.

51161551 is a deficient number, since it is larger than the sum of its proper divisors (10748369).

51161551 is a wasteful number, since it uses less digits than its factorization.

51161551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 429953.

The product of its digits is 750, while the sum is 25.

The square root of 51161551 is about 7152.7303178577. The cubic root of 51161551 is about 371.2341331782.

Adding to 51161551 its reverse (15516115), we get a palindrome (66677666).

The spelling of 51161551 in words is "fifty-one million, one hundred sixty-one thousand, five hundred fifty-one".