61731377 has 2 divisors, whose sum is σ = 61731378. Its totient is φ = 61731376.

The previous prime is 61731349. The next prime is 61731409. The reversal of 61731377 is 77313716.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61716736 + 14641 = 7856^2 + 121^2 .

It is a cyclic number.

It is not a de Polignac number, because 61731377 - 2¹⁶ = 61665841 is a prime.

It is a super-2 number, since 2×61731377² = 7621525812632258, which contains 22 as substring.

It is equal to p_3658634 and since 61731377 and 3658634 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (61731337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30865688 + 30865689.

It is an arithmetic number, because the mean of its divisors is an integer number (30865689).

Almost surely, 2^61731377 is an apocalyptic number.

It is an amenable number.

61731377 is a deficient number, since it is larger than the sum of its proper divisors (1).

61731377 is an equidigital number, since it uses as much as digits as its factorization.

61731377 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18522, while the sum is 35.

The square root of 61731377 is about 7856.9317802817. The cubic root of 61731377 is about 395.2167309249.

The spelling of 61731377 in words is "sixty-one million, seven hundred thirty-one thousand, three hundred seventy-seven".