61403257 has 2 divisors, whose sum is σ = 61403258. Its totient is φ = 61403256.

The previous prime is 61403249. The next prime is 61403299. The reversal of 61403257 is 75230416.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61402896 + 361 = 7836^2 + 19^2 .

It is a cyclic number.

It is not a de Polignac number, because 61403257 - 2³ = 61403249 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (61403227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30701628 + 30701629.

It is an arithmetic number, because the mean of its divisors is an integer number (30701629).

Almost surely, 2^61403257 is an apocalyptic number.

It is an amenable number.

61403257 is a deficient number, since it is larger than the sum of its proper divisors (1).

61403257 is an equidigital number, since it uses as much as digits as its factorization.

61403257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5040, while the sum is 28.

The square root of 61403257 is about 7836.0230346777. The cubic root of 61403257 is about 394.5152564589.

The spelling of 61403257 in words is "sixty-one million, four hundred three thousand, two hundred fifty-seven".