61531727 has 2 divisors, whose sum is σ = 61531728. Its totient is φ = 61531726.

The previous prime is 61531697. The next prime is 61531759. The reversal of 61531727 is 72713516.

It is an a-pointer prime, because the next prime (61531759) can be obtained adding 61531727 to its sum of digits (32).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61531727 - 2⁸ = 61531471 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 61531693 and 61531702.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61531027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30765863 + 30765864.

It is an arithmetic number, because the mean of its divisors is an integer number (30765864).

Almost surely, 2^61531727 is an apocalyptic number.

61531727 is a deficient number, since it is larger than the sum of its proper divisors (1).

61531727 is an equidigital number, since it uses as much as digits as its factorization.

61531727 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8820, while the sum is 32.

The square root of 61531727 is about 7844.2161494951. The cubic root of 61531727 is about 394.7902042458.

The spelling of 61531727 in words is "sixty-one million, five hundred thirty-one thousand, seven hundred twenty-seven".