1655661731 has 2 divisors, whose sum is σ = 1655661732. Its totient is φ = 1655661730.

The previous prime is 1655661719. The next prime is 1655661743. The reversal of 1655661731 is 1371665561.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (1655661719) and next prime (1655661743).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1655661731 is a prime.

It is a super-2 number, since 2×1655661731² = 5482431534995832722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1655661781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 827830865 + 827830866.

It is an arithmetic number, because the mean of its divisors is an integer number (827830866).

Almost surely, 2^1655661731 is an apocalyptic number.

1655661731 is a deficient number, since it is larger than the sum of its proper divisors (1).

1655661731 is an equidigital number, since it uses as much as digits as its factorization.

1655661731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 113400, while the sum is 41.

The square root of 1655661731 is about 40689.8234328929. The cubic root of 1655661731 is about 1183.0157779295.

It can be divided in two parts, 16556 and 61731, that added together give a palindrome (78287).

The spelling of 1655661731 in words is "one billion, six hundred fifty-five million, six hundred sixty-one thousand, seven hundred thirty-one".