61691527 has 2 divisors, whose sum is σ = 61691528. Its totient is φ = 61691526.

The previous prime is 61691491. The next prime is 61691561. The reversal of 61691527 is 72519616.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61691527 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61691587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30845763 + 30845764.

It is an arithmetic number, because the mean of its divisors is an integer number (30845764).

Almost surely, 2^61691527 is an apocalyptic number.

61691527 is a deficient number, since it is larger than the sum of its proper divisors (1).

61691527 is an equidigital number, since it uses as much as digits as its factorization.

61691527 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 22680, while the sum is 37.

The square root of 61691527 is about 7854.3953936633. The cubic root of 61691527 is about 395.1316700387.

The spelling of 61691527 in words is "sixty-one million, six hundred ninety-one thousand, five hundred twenty-seven".