661514131 has 8 divisors (see below), whose sum is σ = 678140064. Its totient is φ = 644911680.

The previous prime is 661514123. The next prime is 661514137. The reversal of 661514131 is 131415166.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 661514131 - 2³ = 661514123 is a prime.

It is a super-2 number, since 2×661514131² = 875201891025370322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 661514131.

It is not an unprimeable number, because it can be changed into a prime (661514137) 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 7 ways as a sum of consecutive naturals, for example, 60426 + ... + 70528.

It is an arithmetic number, because the mean of its divisors is an integer number (84767508).

Almost surely, 2^661514131 is an apocalyptic number.

661514131 is a deficient number, since it is larger than the sum of its proper divisors (16625933).

661514131 is a wasteful number, since it uses less digits than its factorization.

661514131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11741.

The product of its digits is 2160, while the sum is 28.

The square root of 661514131 is about 25719.9170099750. The cubic root of 661514131 is about 871.3240643707.

Adding to 661514131 its reverse (131415166), we get a palindrome (792929297).

The spelling of 661514131 in words is "six hundred sixty-one million, five hundred fourteen thousand, one hundred thirty-one".