61771573 has 2 divisors, whose sum is σ = 61771574. Its totient is φ = 61771572.

The previous prime is 61771559. The next prime is 61771579. The reversal of 61771573 is 37517716.

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., 61748164 + 23409 = 7858^2 + 153^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61771573 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61771579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30885786 + 30885787.

It is an arithmetic number, because the mean of its divisors is an integer number (30885787).

Almost surely, 2^61771573 is an apocalyptic number.

It is an amenable number.

61771573 is a deficient number, since it is larger than the sum of its proper divisors (1).

61771573 is an equidigital number, since it uses as much as digits as its factorization.

61771573 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30870, while the sum is 37.

The square root of 61771573 is about 7859.4893600030. The cubic root of 61771573 is about 395.3024932804.

It can be divided in two parts, 6177 and 1573, that added together give a triangular number (7750 = T₁₂₄).

The spelling of 61771573 in words is "sixty-one million, seven hundred seventy-one thousand, five hundred seventy-three".