61631903 has 2 divisors, whose sum is σ = 61631904. Its totient is φ = 61631902.

The previous prime is 61631863. The next prime is 61631939. The reversal of 61631903 is 30913616.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61631903 - 2¹⁰ = 61630879 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61631303) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30815951 + 30815952.

It is an arithmetic number, because the mean of its divisors is an integer number (30815952).

Almost surely, 2^61631903 is an apocalyptic number.

61631903 is a deficient number, since it is larger than the sum of its proper divisors (1).

61631903 is an equidigital number, since it uses as much as digits as its factorization.

61631903 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2916, while the sum is 29.

The square root of 61631903 is about 7850.5988943519. The cubic root of 61631903 is about 395.0043325915.

The spelling of 61631903 in words is "sixty-one million, six hundred thirty-one thousand, nine hundred three".