61727431 has 2 divisors, whose sum is σ = 61727432. Its totient is φ = 61727430.

The previous prime is 61727411. The next prime is 61727467. The reversal of 61727431 is 13472716.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61727431 - 2²¹ = 59630279 is a prime.

It is a super-2 number, since 2×61727431² = 7620551475719522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 61727393 and 61727402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61727401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30863715 + 30863716.

It is an arithmetic number, because the mean of its divisors is an integer number (30863716).

Almost surely, 2^61727431 is an apocalyptic number.

61727431 is a deficient number, since it is larger than the sum of its proper divisors (1).

61727431 is an equidigital number, since it uses as much as digits as its factorization.

61727431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7056, while the sum is 31.

The square root of 61727431 is about 7856.6806604316. The cubic root of 61727431 is about 395.2083097160.

The spelling of 61727431 in words is "sixty-one million, seven hundred twenty-seven thousand, four hundred thirty-one".