231081501 has 16 divisors (see below), whose sum is σ = 359312000. Its totient is φ = 132045984.

The previous prime is 231081467. The next prime is 231081509. The reversal of 231081501 is 105180132.

It is not a de Polignac number, because 231081501 - 2¹³ = 231073309 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231081509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 111256 + ... + 113313.

It is an arithmetic number, because the mean of its divisors is an integer number (22457000).

Almost surely, 2^231081501 is an apocalyptic number.

231081501 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

231081501 is a deficient number, since it is larger than the sum of its proper divisors (128230499).

231081501 is an equidigital number, since it uses as much as digits as its factorization.

231081501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 224593 (or 224579 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 21.

The square root of 231081501 is about 15201.3651031741. The cubic root of 231081501 is about 613.6513961191.

It can be divided in two parts, 2310 and 81501, that multiplied together give a triangular number (188267310 = T₁₉₄₀₄).

The spelling of 231081501 in words is "two hundred thirty-one million, eighty-one thousand, five hundred one".