61331573 has 2 divisors, whose sum is σ = 61331574. Its totient is φ = 61331572.

The previous prime is 61331551. The next prime is 61331587. The reversal of 61331573 is 37513316.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55681444 + 5650129 = 7462^2 + 2377^2 .

It is a cyclic number.

It is not a de Polignac number, because 61331573 - 2¹⁸ = 61069429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61331513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30665786 + 30665787.

It is an arithmetic number, because the mean of its divisors is an integer number (30665787).

Almost surely, 2^61331573 is an apocalyptic number.

It is an amenable number.

61331573 is a deficient number, since it is larger than the sum of its proper divisors (1).

61331573 is an equidigital number, since it uses as much as digits as its factorization.

61331573 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5670, while the sum is 29.

The square root of 61331573 is about 7831.4476950306. The cubic root of 61331573 is about 394.3616737050.

Adding to 61331573 its reverse (37513316), we get a palindrome (98844889).

The spelling of 61331573 in words is "sixty-one million, three hundred thirty-one thousand, five hundred seventy-three".