51742081 has 4 divisors (see below), whose sum is σ = 51772464. Its totient is φ = 51711700.

The previous prime is 51742063. The next prime is 51742099. The reversal of 51742081 is 18024715.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 18024715 = 5 ⋅3604943.

It is an interprime number because it is at equal distance from previous prime (51742063) and next prime (51742099).

It is a cyclic number.

It is not a de Polignac number, because 51742081 - 2⁵ = 51742049 is a prime.

It is a super-2 number, since 2×51742081² = 5354485892421122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51742001) 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, 12475 + ... + 16096.

It is an arithmetic number, because the mean of its divisors is an integer number (12943116).

Almost surely, 2^51742081 is an apocalyptic number.

It is an amenable number.

51742081 is a deficient number, since it is larger than the sum of its proper divisors (30383).

51742081 is a wasteful number, since it uses less digits than its factorization.

51742081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30382.

The product of its (nonzero) digits is 2240, while the sum is 28.

The square root of 51742081 is about 7193.1968553627. The cubic root of 51742081 is about 372.6329864642.

Adding to 51742081 its reverse (18024715), we get a palindrome (69766796).

The spelling of 51742081 in words is "fifty-one million, seven hundred forty-two thousand, eighty-one".