1398161701 has 2 divisors, whose sum is σ = 1398161702. Its totient is φ = 1398161700.

The previous prime is 1398161621. The next prime is 1398161707. The reversal of 1398161701 is 1071618931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1370850625 + 27311076 = 37025^2 + 5226^2 .

It is an emirp because it is prime and its reverse (1071618931) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1398161701 - 2¹⁵ = 1398128933 is a prime.

It is a super-2 number, since 2×1398161701² = 3909712284286426802, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1398161707) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 699080850 + 699080851.

It is an arithmetic number, because the mean of its divisors is an integer number (699080851).

Almost surely, 2^1398161701 is an apocalyptic number.

It is an amenable number.

1398161701 is a deficient number, since it is larger than the sum of its proper divisors (1).

1398161701 is an equidigital number, since it uses as much as digits as its factorization.

1398161701 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9072, while the sum is 37.

The square root of 1398161701 is about 37392.0004947582. Note that the first 3 decimals coincide. The cubic root of 1398161701 is about 1118.1990883852.

Subtracting from 1398161701 its sum of digits (37), we obtain a square (1398161664 = 37392²).

The spelling of 1398161701 in words is "one billion, three hundred ninety-eight million, one hundred sixty-one thousand, seven hundred one".