2031209491 has 2 divisors, whose sum is σ = 2031209492. Its totient is φ = 2031209490.

The previous prime is 2031209429. The next prime is 2031209501. The reversal of 2031209491 is 1949021302.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2031209491 - 2¹⁷ = 2031078419 is a prime.

It is not a weakly prime, because it can be changed into another prime (2031209291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1015604745 + 1015604746.

It is an arithmetic number, because the mean of its divisors is an integer number (1015604746).

Almost surely, 2^2031209491 is an apocalyptic number.

2031209491 is a deficient number, since it is larger than the sum of its proper divisors (1).

2031209491 is an equidigital number, since it uses as much as digits as its factorization.

2031209491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 2031209491 is about 45068.9415340542. The cubic root of 2031209491 is about 1266.4408358322.

The spelling of 2031209491 in words is "two billion, thirty-one million, two hundred nine thousand, four hundred ninety-one".