681949125 has 192 divisors, whose sum is σ = 1507274496. Its totient is φ = 303264000.

The previous prime is 681949117. The next prime is 681949153. The reversal of 681949125 is 521949186.

It is not a de Polignac number, because 681949125 - 2³ = 681949117 is a prime.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 4343547 + ... + 4343703.

It is an arithmetic number, because the mean of its divisors is an integer number (7850388).

Almost surely, 2^681949125 is an apocalyptic number.

681949125 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

681949125 is an abundant number, since it is smaller than the sum of its proper divisors (825325371).

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

681949125 is a wasteful number, since it uses less digits than its factorization.

681949125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211 (or 189 counting only the distinct ones).

The product of its digits is 155520, while the sum is 45.

The square root of 681949125 is about 26114.1556440181. The cubic root of 681949125 is about 880.2053261415.

The spelling of 681949125 in words is "six hundred eighty-one million, nine hundred forty-nine thousand, one hundred twenty-five".