1331031971 has 2 divisors, whose sum is σ = 1331031972. Its totient is φ = 1331031970.

The previous prime is 1331031967. The next prime is 1331031973. The reversal of 1331031971 is 1791301331.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1331031971 - 2² = 1331031967 is a prime.

It is a super-2 number, since 2×1331031971² = 3543292215648289682, which contains 22 as substring.

Together with 1331031973, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1331031973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 665515985 + 665515986.

It is an arithmetic number, because the mean of its divisors is an integer number (665515986).

Almost surely, 2^1331031971 is an apocalyptic number.

1331031971 is a deficient number, since it is larger than the sum of its proper divisors (1).

1331031971 is an equidigital number, since it uses as much as digits as its factorization.

1331031971 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1701, while the sum is 29.

The square root of 1331031971 is about 36483.3108557872. The cubic root of 1331031971 is about 1100.0088073675.

The spelling of 1331031971 in words is "one billion, three hundred thirty-one million, thirty-one thousand, nine hundred seventy-one".