1661301031 has 4 divisors (see below), whose sum is σ = 1789093432. Its totient is φ = 1533508632.

The previous prime is 1661301029. The next prime is 1661301091. The reversal of 1661301031 is 1301031661.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1661301031 - 2¹ = 1661301029 is a prime.

It is a super-2 number, since 2×1661301031² = 5519842231203325922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1661300993 and 1661301011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1661301011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63896181 + ... + 63896206.

It is an arithmetic number, because the mean of its divisors is an integer number (447273358).

Almost surely, 2^1661301031 is an apocalyptic number.

1661301031 is a deficient number, since it is larger than the sum of its proper divisors (127792401).

1661301031 is a wasteful number, since it uses less digits than its factorization.

1661301031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127792400.

The product of its (nonzero) digits is 324, while the sum is 22.

The square root of 1661301031 is about 40759.0607227399. The cubic root of 1661301031 is about 1184.3574007693.

Adding to 1661301031 its reverse (1301031661), we get a palindrome (2962332692).

The spelling of 1661301031 in words is "one billion, six hundred sixty-one million, three hundred one thousand, thirty-one".