691242986 has 16 divisors (see below), whose sum is σ = 1201222464. Its totient is φ = 292188384.

The previous prime is 691242983. The next prime is 691243019. The reversal of 691242986 is 689242196.

It is a self number, because there is not a number n which added to its sum of digits gives 691242986.

It is not an unprimeable number, because it can be changed into a prime (691242983) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 337160 + ... + 339203.

It is an arithmetic number, because the mean of its divisors is an integer number (75076404).

Almost surely, 2^691242986 is an apocalyptic number.

691242986 is a deficient number, since it is larger than the sum of its proper divisors (509979478).

691242986 is a wasteful number, since it uses less digits than its factorization.

691242986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 676445.

The product of its digits is 373248, while the sum is 47.

The square root of 691242986 is about 26291.5002614914. The cubic root of 691242986 is about 884.1858882032.

The spelling of 691242986 in words is "six hundred ninety-one million, two hundred forty-two thousand, nine hundred eighty-six".