130691986 has 4 divisors (see below), whose sum is σ = 196037982. Its totient is φ = 65345992.

The previous prime is 130691983. The next prime is 130691987. The reversal of 130691986 is 689196031.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 100100025 + 30591961 = 10005^2 + 5531^2 .

It is not an unprimeable number, because it can be changed into a prime (130691983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32672995 + ... + 32672998.

Almost surely, 2^130691986 is an apocalyptic number.

130691986 is a deficient number, since it is larger than the sum of its proper divisors (65345996).

130691986 is an equidigital number, since it uses as much as digits as its factorization.

130691986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65345995.

The product of its (nonzero) digits is 69984, while the sum is 43.

The square root of 130691986 is about 11432.0595694739. The cubic root of 130691986 is about 507.4769478395.

The spelling of 130691986 in words is "one hundred thirty million, six hundred ninety-one thousand, nine hundred eighty-six".