131891706 has 64 divisors (see below), whose sum is σ = 309104640. Its totient is φ = 41603760.

The previous prime is 131891689. The next prime is 131891723. The reversal of 131891706 is 607198131.

It is an interprime number because it is at equal distance from previous prime (131891689) and next prime (131891723).

It is a super-2 number, since 2×131891706² = 34790844223180872, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 127411 + ... + 128441.

It is an arithmetic number, because the mean of its divisors is an integer number (4829760).

Almost surely, 2^131891706 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 131891706, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (154552320).

131891706 is an abundant number, since it is smaller than the sum of its proper divisors (177212934).

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

131891706 is a wasteful number, since it uses less digits than its factorization.

131891706 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1168 (or 1162 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 36.

The square root of 131891706 is about 11484.4114346361. The cubic root of 131891706 is about 509.0250578534.

The spelling of 131891706 in words is "one hundred thirty-one million, eight hundred ninety-one thousand, seven hundred six".