1985290451 has 2 divisors, whose sum is σ = 1985290452. Its totient is φ = 1985290450.

The previous prime is 1985290429. The next prime is 1985290493. The reversal of 1985290451 is 1540925891.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1985290451 is a prime.

It is not a weakly prime, because it can be changed into another prime (1985299451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 992645225 + 992645226.

It is an arithmetic number, because the mean of its divisors is an integer number (992645226).

Almost surely, 2^1985290451 is an apocalyptic number.

1985290451 is a deficient number, since it is larger than the sum of its proper divisors (1).

1985290451 is an equidigital number, since it uses as much as digits as its factorization.

1985290451 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 129600, while the sum is 44.

The square root of 1985290451 is about 44556.5982880201. The cubic root of 1985290451 is about 1256.8246345600.

The spelling of 1985290451 in words is "one billion, nine hundred eighty-five million, two hundred ninety thousand, four hundred fifty-one".