1641956731 has 2 divisors, whose sum is σ = 1641956732. Its totient is φ = 1641956730.

The previous prime is 1641956717. The next prime is 1641956737. The reversal of 1641956731 is 1376591461.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1641956731 - 2⁹ = 1641956219 is a prime.

It is a super-2 number, since 2×1641956731² = 5392043812952412722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1641956737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 820978365 + 820978366.

It is an arithmetic number, because the mean of its divisors is an integer number (820978366).

Almost surely, 2^1641956731 is an apocalyptic number.

1641956731 is a deficient number, since it is larger than the sum of its proper divisors (1).

1641956731 is an equidigital number, since it uses as much as digits as its factorization.

1641956731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 136080, while the sum is 43.

The square root of 1641956731 is about 40521.0652747432. The cubic root of 1641956731 is about 1179.7425300076.

The spelling of 1641956731 in words is "one billion, six hundred forty-one million, nine hundred fifty-six thousand, seven hundred thirty-one".