61471831 has 2 divisors, whose sum is σ = 61471832. Its totient is φ = 61471830.

The previous prime is 61471807. The next prime is 61471873. The reversal of 61471831 is 13817416.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61471831 - 2²³ = 53083223 is a prime.

It is a super-2 number, since 2×61471831² = 7557572012985122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 61471793 and 61471802.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61471231) 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, 30735915 + 30735916.

It is an arithmetic number, because the mean of its divisors is an integer number (30735916).

Almost surely, 2^61471831 is an apocalyptic number.

61471831 is a deficient number, since it is larger than the sum of its proper divisors (1).

61471831 is an equidigital number, since it uses as much as digits as its factorization.

61471831 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4032, while the sum is 31.

The square root of 61471831 is about 7840.3973751335. The cubic root of 61471831 is about 394.6620642224.

The spelling of 61471831 in words is "sixty-one million, four hundred seventy-one thousand, eight hundred thirty-one".