1396172681 has 2 divisors, whose sum is σ = 1396172682. Its totient is φ = 1396172680.

The previous prime is 1396172663. The next prime is 1396172711. The reversal of 1396172681 is 1862716931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1375742281 + 20430400 = 37091^2 + 4520^2 .

It is an emirp because it is prime and its reverse (1862716931) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1396172681 - 2²⁶ = 1329063817 is a prime.

It is a super-2 number, since 2×1396172681² = 3898596310341455522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1396172081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 698086340 + 698086341.

It is an arithmetic number, because the mean of its divisors is an integer number (698086341).

Almost surely, 2^1396172681 is an apocalyptic number.

It is an amenable number.

1396172681 is a deficient number, since it is larger than the sum of its proper divisors (1).

1396172681 is an equidigital number, since it uses as much as digits as its factorization.

1396172681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108864, while the sum is 44.

The square root of 1396172681 is about 37365.3941635840. The cubic root of 1396172681 is about 1117.6685880244.

The spelling of 1396172681 in words is "one billion, three hundred ninety-six million, one hundred seventy-two thousand, six hundred eighty-one".