51520541 has 4 divisors (see below), whose sum is σ = 51534912. Its totient is φ = 51506172.

The previous prime is 51520499. The next prime is 51520583. The reversal of 51520541 is 14502515.

It is a happy number.

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 a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 14502515 = 5 ⋅2900503.

It is an interprime number because it is at equal distance from previous prime (51520499) and next prime (51520583).

It is a cyclic number.

It is not a de Polignac number, because 51520541 - 2¹⁸ = 51258397 is a prime.

It is a super-2 number, since 2×51520541² = 5308732289865362, 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 (51420541) 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, 3110 + ... + 10616.

It is an arithmetic number, because the mean of its divisors is an integer number (12883728).

Almost surely, 2^51520541 is an apocalyptic number.

It is an amenable number.

51520541 is a deficient number, since it is larger than the sum of its proper divisors (14371).

51520541 is an equidigital number, since it uses as much as digits as its factorization.

51520541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14370.

The product of its (nonzero) digits is 1000, while the sum is 23.

The square root of 51520541 is about 7177.7810638107. The cubic root of 51520541 is about 372.1004011766.

The spelling of 51520541 in words is "fifty-one million, five hundred twenty thousand, five hundred forty-one".