1391732401 has 2 divisors, whose sum is σ = 1391732402. Its totient is φ = 1391732400.

The previous prime is 1391732399. The next prime is 1391732411. The reversal of 1391732401 is 1042371931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 937829376 + 453903025 = 30624^2 + 21305^2 .

It is a cyclic number.

It is not a de Polignac number, because 1391732401 - 2¹ = 1391732399 is a prime.

Together with 1391732399, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1391732411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 695866200 + 695866201.

It is an arithmetic number, because the mean of its divisors is an integer number (695866201).

Almost surely, 2^1391732401 is an apocalyptic number.

It is an amenable number.

1391732401 is a deficient number, since it is larger than the sum of its proper divisors (1).

1391732401 is an equidigital number, since it uses as much as digits as its factorization.

1391732401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4536, while the sum is 31.

The square root of 1391732401 is about 37305.9298369576. The cubic root of 1391732401 is about 1116.4824807178.

The spelling of 1391732401 in words is "one billion, three hundred ninety-one million, seven hundred thirty-two thousand, four hundred one".