131211240 has 32 divisors (see below), whose sum is σ = 393634080. Its totient is φ = 34989632.

The previous prime is 131211229. The next prime is 131211271. The reversal of 131211240 is 42112131.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 546594 + ... + 546833.

It is an arithmetic number, because the mean of its divisors is an integer number (12301065).

Almost surely, 2^131211240 is an apocalyptic number.

131211240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

131211240 is an abundant number, since it is smaller than the sum of its proper divisors (262422840).

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

131211240 is a wasteful number, since it uses less digits than its factorization.

131211240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1093441 (or 1093437 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 131211240 is about 11454.7474873958. The cubic root of 131211240 is about 508.1481474215.

Adding to 131211240 its reverse (42112131), we get a palindrome (173323371).

The spelling of 131211240 in words is "one hundred thirty-one million, two hundred eleven thousand, two hundred forty".