2031647381 has 2 divisors, whose sum is σ = 2031647382. Its totient is φ = 2031647380.

The previous prime is 2031647347. The next prime is 2031647399. The reversal of 2031647381 is 1837461302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1589218225 + 442429156 = 39865^2 + 21034^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2031647381 is a prime.

It is a super-2 number, since 2×2031647381² = 8255182161448318322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2031647081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1015823690 + 1015823691.

It is an arithmetic number, because the mean of its divisors is an integer number (1015823691).

Almost surely, 2^2031647381 is an apocalyptic number.

It is an amenable number.

2031647381 is a deficient number, since it is larger than the sum of its proper divisors (1).

2031647381 is an equidigital number, since it uses as much as digits as its factorization.

2031647381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 2031647381 is about 45073.7992740794. The cubic root of 2031647381 is about 1266.5318361178.

The spelling of 2031647381 in words is "two billion, thirty-one million, six hundred forty-seven thousand, three hundred eighty-one".