491537970 has 384 divisors, whose sum is σ = 1720922112. Its totient is φ = 97977600.

The previous prime is 491537957. The next prime is 491537989. The reversal of 491537970 is 79735194.

491537970 is a `hidden beast` number, since 49 + 1 + 537 + 9 + 70 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 6923035 + ... + 6923105.

It is an arithmetic number, because the mean of its divisors is an integer number (4481568).

Almost surely, 2^491537970 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 491537970, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (860461056).

491537970 is an abundant number, since it is smaller than the sum of its proper divisors (1229384142).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

491537970 is a wasteful number, since it uses less digits than its factorization.

491537970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148 (or 136 counting only the distinct ones).

The product of its (nonzero) digits is 238140, while the sum is 45.

The square root of 491537970 is about 22170.6556060032. The cubic root of 491537970 is about 789.1974812534.

The spelling of 491537970 in words is "four hundred ninety-one million, five hundred thirty-seven thousand, nine hundred seventy".