51542661 has 4 divisors (see below), whose sum is σ = 68723552. Its totient is φ = 34361772.

The previous prime is 51542651. The next prime is 51542669. The reversal of 51542661 is 16624515.

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.

It is not a de Polignac number, because 51542661 - 2¹¹ = 51540613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51542669) 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, 8590441 + ... + 8590446.

It is an arithmetic number, because the mean of its divisors is an integer number (17180888).

Almost surely, 2^51542661 is an apocalyptic number.

It is an amenable number.

51542661 is a deficient number, since it is larger than the sum of its proper divisors (17180891).

51542661 is a wasteful number, since it uses less digits than its factorization.

51542661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17180890.

The product of its digits is 7200, while the sum is 30.

The square root of 51542661 is about 7179.3217646237. The cubic root of 51542661 is about 372.1536464974.

The spelling of 51542661 in words is "fifty-one million, five hundred forty-two thousand, six hundred sixty-one".