51117461 has 4 divisors (see below), whose sum is σ = 52499052. Its totient is φ = 49735872.

The previous prime is 51117439. The next prime is 51117463. The reversal of 51117461 is 16471115.

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 2 ways, for example, as 25300900 + 25816561 = 5030^2 + 5081^2 .

It is a cyclic number.

It is not a de Polignac number, because 51117461 - 2⁶ = 51117397 is a prime.

It is a super-2 number, since 2×51117461² = 5225989638173042, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51117461.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51117463) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 690740 + ... + 690813.

It is an arithmetic number, because the mean of its divisors is an integer number (13124763).

Almost surely, 2^51117461 is an apocalyptic number.

It is an amenable number.

51117461 is a deficient number, since it is larger than the sum of its proper divisors (1381591).

51117461 is a wasteful number, since it uses less digits than its factorization.

51117461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1381590.

The product of its digits is 840, while the sum is 26.

The square root of 51117461 is about 7149.6476136940. The cubic root of 51117461 is about 371.1274618163.

Adding to 51117461 its reverse (16471115), we get a palindrome (67588576).

The spelling of 51117461 in words is "fifty-one million, one hundred seventeen thousand, four hundred sixty-one".