51101551 has 8 divisors (see below), whose sum is σ = 52572240. Its totient is φ = 49635648.

The previous prime is 51101527. The next prime is 51101569. The reversal of 51101551 is 15510115.

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 51101551 - 2¹⁵ = 51068783 is a prime.

It is a super-2 number, since 2×51101551² = 5222737029211202, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51101581) 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, 39960 + ... + 41218.

It is an arithmetic number, because the mean of its divisors is an integer number (6571530).

Almost surely, 2^51101551 is an apocalyptic number.

51101551 is a deficient number, since it is larger than the sum of its proper divisors (1470689).

51101551 is a wasteful number, since it uses less digits than its factorization.

51101551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2393.

The product of its (nonzero) digits is 125, while the sum is 19.

The square root of 51101551 is about 7148.5348848558. The cubic root of 51101551 is about 371.0889540963.

Adding to 51101551 its reverse (15510115), we get a palindrome (66611666).

The spelling of 51101551 in words is "fifty-one million, one hundred one thousand, five hundred fifty-one".