131001998 has 16 divisors (see below), whose sum is σ = 207083520. Its totient is φ = 61982136.

The previous prime is 131001991. The next prime is 131002009. The reversal of 131001998 is 899100131.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131001991) 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, 47411 + ... + 50097.

It is an arithmetic number, because the mean of its divisors is an integer number (12942720).

Almost surely, 2^131001998 is an apocalyptic number.

131001998 is a deficient number, since it is larger than the sum of its proper divisors (76081522).

131001998 is a wasteful number, since it uses less digits than its factorization.

131001998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3991.

The product of its (nonzero) digits is 1944, while the sum is 32.

The square root of 131001998 is about 11445.6104249621. The cubic root of 131001998 is about 507.8778898227.

The spelling of 131001998 in words is "one hundred thirty-one million, one thousand, nine hundred ninety-eight".