1398861461 has 2 divisors, whose sum is σ = 1398861462. Its totient is φ = 1398861460.

The previous prime is 1398861421. The next prime is 1398861463. The reversal of 1398861461 is 1641688931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1397638225 + 1223236 = 37385^2 + 1106^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1398861461 is a prime.

Together with 1398861463, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1398861463) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 699430730 + 699430731.

It is an arithmetic number, because the mean of its divisors is an integer number (699430731).

Almost surely, 2^1398861461 is an apocalyptic number.

It is an amenable number.

1398861461 is a deficient number, since it is larger than the sum of its proper divisors (1).

1398861461 is an equidigital number, since it uses as much as digits as its factorization.

1398861461 is an evil number, because the sum of its binary digits is even.

The product of its digits is 248832, while the sum is 47.

The square root of 1398861461 is about 37401.3564058845. The cubic root of 1398861461 is about 1118.3856048402.

The spelling of 1398861461 in words is "one billion, three hundred ninety-eight million, eight hundred sixty-one thousand, four hundred sixty-one".