661131283 has 2 divisors, whose sum is σ = 661131284. Its totient is φ = 661131282.

The previous prime is 661131257. The next prime is 661131287. The reversal of 661131283 is 382131166.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 661131283 - 2¹⁷ = 661000211 is a prime.

It is a super-2 number, since 2×661131283² = 874189146722452178, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (661131287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330565641 + 330565642.

It is an arithmetic number, because the mean of its divisors is an integer number (330565642).

Almost surely, 2^661131283 is an apocalyptic number.

661131283 is a deficient number, since it is larger than the sum of its proper divisors (1).

661131283 is an equidigital number, since it uses as much as digits as its factorization.

661131283 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5184, while the sum is 31.

The square root of 661131283 is about 25712.4732960484. The cubic root of 661131283 is about 871.1559404491.

The spelling of 661131283 in words is "six hundred sixty-one million, one hundred thirty-one thousand, two hundred eighty-three".