61697387 has 2 divisors, whose sum is σ = 61697388. Its totient is φ = 61697386.

The previous prime is 61697371. The next prime is 61697401. The reversal of 61697387 is 78379616.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61697387 - 2⁴ = 61697371 is a prime.

It is not a weakly prime, because it can be changed into another prime (61697357) 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, 30848693 + 30848694.

It is an arithmetic number, because the mean of its divisors is an integer number (30848694).

Almost surely, 2^61697387 is an apocalyptic number.

61697387 is a deficient number, since it is larger than the sum of its proper divisors (1).

61697387 is an equidigital number, since it uses as much as digits as its factorization.

61697387 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 381024, while the sum is 47.

The square root of 61697387 is about 7854.7684243394. The cubic root of 61697387 is about 395.1441806615.

The spelling of 61697387 in words is "sixty-one million, six hundred ninety-seven thousand, three hundred eighty-seven".