61819573 has 2 divisors, whose sum is σ = 61819574. Its totient is φ = 61819572.

The previous prime is 61819553. The next prime is 61819579. The reversal of 61819573 is 37591816.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 60326289 + 1493284 = 7767^2 + 1222^2 .

It is a cyclic number.

It is not a de Polignac number, because 61819573 - 2¹³ = 61811381 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61819579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30909786 + 30909787.

It is an arithmetic number, because the mean of its divisors is an integer number (30909787).

Almost surely, 2^61819573 is an apocalyptic number.

It is an amenable number.

61819573 is a deficient number, since it is larger than the sum of its proper divisors (1).

61819573 is an equidigital number, since it uses as much as digits as its factorization.

61819573 is an evil number, because the sum of its binary digits is even.

The product of its digits is 45360, while the sum is 40.

The square root of 61819573 is about 7862.5424005216. The cubic root of 61819573 is about 395.4048575564.

The spelling of 61819573 in words is "sixty-one million, eight hundred nineteen thousand, five hundred seventy-three".