691450146 has 48 divisors (see below), whose sum is σ = 1613196000. Its totient is φ = 213243264.

The previous prime is 691450121. The next prime is 691450153. The reversal of 691450146 is 641054196.

691450146 is a `hidden beast` number, since 69 + 1 + 450 + 146 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 691450146.

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 23 ways as a sum of consecutive naturals, for example, 1096 + ... + 37203.

It is an arithmetic number, because the mean of its divisors is an integer number (33608250).

Almost surely, 2^691450146 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 691450146, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (806598000).

691450146 is an abundant number, since it is smaller than the sum of its proper divisors (921745854).

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

691450146 is a wasteful number, since it uses less digits than its factorization.

691450146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38383 (or 38380 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 691450146 is about 26295.4396426453. The cubic root of 691450146 is about 884.2742071964.

The spelling of 691450146 in words is "six hundred ninety-one million, four hundred fifty thousand, one hundred forty-six".