61591393 has 2 divisors, whose sum is σ = 61591394. Its totient is φ = 61591392.

The previous prime is 61591381. The next prime is 61591399. The reversal of 61591393 is 39319516.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61591104 + 289 = 7848^2 + 17^2 .

It is a cyclic number.

It is not a de Polignac number, because 61591393 - 2¹³ = 61583201 is a prime.

It is not a weakly prime, because it can be changed into another prime (61591399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30795696 + 30795697.

It is an arithmetic number, because the mean of its divisors is an integer number (30795697).

Almost surely, 2^61591393 is an apocalyptic number.

It is an amenable number.

61591393 is a deficient number, since it is larger than the sum of its proper divisors (1).

61591393 is an equidigital number, since it uses as much as digits as its factorization.

61591393 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21870, while the sum is 37.

The square root of 61591393 is about 7848.0184123128. The cubic root of 61591393 is about 394.9177695621.

The spelling of 61591393 in words is "sixty-one million, five hundred ninety-one thousand, three hundred ninety-three".