61897751 has 2 divisors, whose sum is σ = 61897752. Its totient is φ = 61897750.

The previous prime is 61897733. The next prime is 61897757. The reversal of 61897751 is 15779816.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61897751 - 2¹⁰ = 61896727 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 (61897757) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30948875 + 30948876.

It is an arithmetic number, because the mean of its divisors is an integer number (30948876).

Almost surely, 2^61897751 is an apocalyptic number.

61897751 is a deficient number, since it is larger than the sum of its proper divisors (1).

61897751 is an equidigital number, since it uses as much as digits as its factorization.

61897751 is an evil number, because the sum of its binary digits is even.

The product of its digits is 105840, while the sum is 44.

The square root of 61897751 is about 7867.5123768571. The cubic root of 61897751 is about 395.5714657358.

The spelling of 61897751 in words is "sixty-one million, eight hundred ninety-seven thousand, seven hundred fifty-one".