61524421 has 4 divisors (see below), whose sum is σ = 70313632. Its totient is φ = 52735212.

The previous prime is 61524401. The next prime is 61524431. The reversal of 61524421 is 12442516.

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.

It is a cyclic number.

It is not a de Polignac number, because 61524421 - 2⁵ = 61524389 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 (61524401) 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, 4394595 + ... + 4394608.

It is an arithmetic number, because the mean of its divisors is an integer number (17578408).

Almost surely, 2^61524421 is an apocalyptic number.

It is an amenable number.

61524421 is a deficient number, since it is larger than the sum of its proper divisors (8789211).

61524421 is an equidigital number, since it uses as much as digits as its factorization.

61524421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8789210.

The product of its digits is 1920, while the sum is 25.

The square root of 61524421 is about 7843.7504422311. The cubic root of 61524421 is about 394.7745784240.

Adding to 61524421 its reverse (12442516), we get a palindrome (73966937).

The spelling of 61524421 in words is "sixty-one million, five hundred twenty-four thousand, four hundred twenty-one".