491970623 has 6 divisors (see below), whose sum is σ = 495554904. Its totient is φ = 488412084.

The previous prime is 491970613. The next prime is 491970637. The reversal of 491970623 is 326079194.

It is not a de Polignac number, because 491970623 - 2¹⁸ = 491708479 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491970613) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6590 + ... + 32052.

It is an arithmetic number, because the mean of its divisors is an integer number (82592484).

Almost surely, 2^491970623 is an apocalyptic number.

491970623 is a deficient number, since it is larger than the sum of its proper divisors (3584281).

491970623 is an equidigital number, since it uses as much as digits as its factorization.

491970623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25741 (or 25602 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 41.

The square root of 491970623 is about 22180.4107942121. The cubic root of 491970623 is about 789.4289645747.

The spelling of 491970623 in words is "four hundred ninety-one million, nine hundred seventy thousand, six hundred twenty-three".