1346851991 has 2 divisors, whose sum is σ = 1346851992. Its totient is φ = 1346851990.

The previous prime is 1346851981. The next prime is 1346851997. The reversal of 1346851991 is 1991586431.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1346851991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1346851997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 673425995 + 673425996.

It is an arithmetic number, because the mean of its divisors is an integer number (673425996).

Almost surely, 2^1346851991 is an apocalyptic number.

1346851991 is a deficient number, since it is larger than the sum of its proper divisors (1).

1346851991 is an equidigital number, since it uses as much as digits as its factorization.

1346851991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 233280, while the sum is 47.

The square root of 1346851991 is about 36699.4821625592. The cubic root of 1346851991 is about 1104.3497169639.

The spelling of 1346851991 in words is "one billion, three hundred forty-six million, eight hundred fifty-one thousand, nine hundred ninety-one".