660151231 has 4 divisors (see below), whose sum is σ = 681446464. Its totient is φ = 638856000.

The previous prime is 660151223. The next prime is 660151249. The reversal of 660151231 is 132151066.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 132151066 = 2 ⋅66075533.

It is a cyclic number.

It is not a de Polignac number, because 660151231 - 2³ = 660151223 is a prime.

It is a super-2 number, since 2×660151231² = 871599295581630722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 660151196 and 660151205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660151031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10647570 + ... + 10647631.

It is an arithmetic number, because the mean of its divisors is an integer number (170361616).

Almost surely, 2^660151231 is an apocalyptic number.

660151231 is a deficient number, since it is larger than the sum of its proper divisors (21295233).

660151231 is a wasteful number, since it uses less digits than its factorization.

660151231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21295232.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 660151231 is about 25693.4083180881. The cubic root of 660151231 is about 870.7252643399.

The spelling of 660151231 in words is "six hundred sixty million, one hundred fifty-one thousand, two hundred thirty-one".