1661120131 has 8 divisors (see below), whose sum is σ = 1823675184. Its totient is φ = 1500489120.

The previous prime is 1661120129. The next prime is 1661120137. The reversal of 1661120131 is 1310211661.

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 1661120131 - 2¹ = 1661120129 is a prime.

It is a super-2 number, since 2×1661120131² = 5518640179226914322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1661120137) 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 7 ways as a sum of consecutive naturals, for example, 479200 + ... + 482653.

It is an arithmetic number, because the mean of its divisors is an integer number (227959398).

Almost surely, 2^1661120131 is an apocalyptic number.

1661120131 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1661120131 is a deficient number, since it is larger than the sum of its proper divisors (162555053).

1661120131 is a wasteful number, since it uses less digits than its factorization.

1661120131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 962021.

The product of its (nonzero) digits is 216, while the sum is 22.

The square root of 1661120131 is about 40756.8415238473. The cubic root of 1661120131 is about 1184.3144107619.

Adding to 1661120131 its reverse (1310211661), we get a palindrome (2971331792).

The spelling of 1661120131 in words is "one billion, six hundred sixty-one million, one hundred twenty thousand, one hundred thirty-one".