131021745 has 32 divisors (see below), whose sum is σ = 213269760. Its totient is φ = 68678400.

The previous prime is 131021743. The next prime is 131021753. The reversal of 131021745 is 547120131.

It is not a de Polignac number, because 131021745 - 2¹ = 131021743 is a prime.

It is not an unprimeable number, because it can be changed into a prime (131021741) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 298236 + ... + 298674.

It is an arithmetic number, because the mean of its divisors is an integer number (6664680).

Almost surely, 2^131021745 is an apocalyptic number.

131021745 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

131021745 is a deficient number, since it is larger than the sum of its proper divisors (82248015).

131021745 is a wasteful number, since it uses less digits than its factorization.

131021745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 745.

The product of its (nonzero) digits is 840, while the sum is 24.

The square root of 131021745 is about 11446.4730375780. The cubic root of 131021745 is about 507.9034074000.

Adding to 131021745 its reverse (547120131), we get a palindrome (678141876).

The spelling of 131021745 in words is "one hundred thirty-one million, twenty-one thousand, seven hundred forty-five".