498739861 has 2 divisors, whose sum is σ = 498739862. Its totient is φ = 498739860.

The previous prime is 498739853. The next prime is 498739907. The reversal of 498739861 is 168937894.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 488144836 + 10595025 = 22094^2 + 3255^2 .

It is a cyclic number.

It is not a de Polignac number, because 498739861 - 2³ = 498739853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (498739961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 249369930 + 249369931.

It is an arithmetic number, because the mean of its divisors is an integer number (249369931).

Almost surely, 2^498739861 is an apocalyptic number.

It is an amenable number.

498739861 is a deficient number, since it is larger than the sum of its proper divisors (1).

498739861 is an equidigital number, since it uses as much as digits as its factorization.

498739861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2612736, while the sum is 55.

The square root of 498739861 is about 22332.4844341153. The cubic root of 498739861 is about 793.0331830484.

The spelling of 498739861 in words is "four hundred ninety-eight million, seven hundred thirty-nine thousand, eight hundred sixty-one".