61890457 has 2 divisors, whose sum is σ = 61890458. Its totient is φ = 61890456.

The previous prime is 61890419. The next prime is 61890461. The reversal of 61890457 is 75409816.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61842496 + 47961 = 7864^2 + 219^2 .

It is a cyclic number.

It is not a de Polignac number, because 61890457 - 2¹⁹ = 61366169 is a prime.

It is not a weakly prime, because it can be changed into another prime (61890407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30945228 + 30945229.

It is an arithmetic number, because the mean of its divisors is an integer number (30945229).

Almost surely, 2^61890457 is an apocalyptic number.

It is an amenable number.

61890457 is a deficient number, since it is larger than the sum of its proper divisors (1).

61890457 is an equidigital number, since it uses as much as digits as its factorization.

61890457 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 60480, while the sum is 40.

The square root of 61890457 is about 7867.0488113396. The cubic root of 61890457 is about 395.5559271442. Note that the first 3 decimals are identical.

The spelling of 61890457 in words is "sixty-one million, eight hundred ninety thousand, four hundred fifty-seven".