61557941 has 2 divisors, whose sum is σ = 61557942. Its totient is φ = 61557940.

The previous prime is 61557887. The next prime is 61557943. The reversal of 61557941 is 14975516.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36857041 + 24700900 = 6071^2 + 4970^2 .

It is a cyclic number.

It is not a de Polignac number, because 61557941 - 2¹⁸ = 61295797 is a prime.

Together with 61557943, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 61557895 and 61557904.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61557943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30778970 + 30778971.

It is an arithmetic number, because the mean of its divisors is an integer number (30778971).

Almost surely, 2^61557941 is an apocalyptic number.

It is an amenable number.

61557941 is a deficient number, since it is larger than the sum of its proper divisors (1).

61557941 is an equidigital number, since it uses as much as digits as its factorization.

61557941 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 37800, while the sum is 38.

The square root of 61557941 is about 7845.8868842216. The cubic root of 61557941 is about 394.8462596696.

The spelling of 61557941 in words is "sixty-one million, five hundred fifty-seven thousand, nine hundred forty-one".