61523321 has 4 divisors (see below), whose sum is σ = 64198272. Its totient is φ = 58848372.

The previous prime is 61523309. The next prime is 61523347. The reversal of 61523321 is 12332516.

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 61523321 - 2⁶ = 61523257 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23), and also a Moran number because the ratio is a prime number: 2674927 = 61523321 / (6 + 1 + 5 + 2 + 3 + 3 + 2 + 1).

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (61523381) 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, 1337441 + ... + 1337486.

It is an arithmetic number, because the mean of its divisors is an integer number (16049568).

Almost surely, 2^61523321 is an apocalyptic number.

It is an amenable number.

61523321 is a deficient number, since it is larger than the sum of its proper divisors (2674951).

61523321 is a wasteful number, since it uses less digits than its factorization.

61523321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2674950.

The product of its digits is 1080, while the sum is 23.

The square root of 61523321 is about 7843.6803223997. The cubic root of 61523321 is about 394.7722256747.

Adding to 61523321 its reverse (12332516), we get a palindrome (73855837).

The spelling of 61523321 in words is "sixty-one million, five hundred twenty-three thousand, three hundred twenty-one".