1406387271781 has 2 divisors, whose sum is σ = 1406387271782. Its totient is φ = 1406387271780.

The previous prime is 1406387271733. The next prime is 1406387271797. The reversal of 1406387271781 is 1871727836041.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 886883645025 + 519503626756 = 941745^2 + 720766^2 .

It is a cyclic number.

It is not a de Polignac number, because 1406387271781 - 2⁹ = 1406387271269 is a prime.

It is a super-2 number, since 2×1406387271781² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1406387271701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 703193635890 + 703193635891.

It is an arithmetic number, because the mean of its divisors is an integer number (703193635891).

Almost surely, 2^{1406387271781} is an apocalyptic number.

It is an amenable number.

1406387271781 is a deficient number, since it is larger than the sum of its proper divisors (1).

1406387271781 is an equidigital number, since it uses as much as digits as its factorization.

1406387271781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3161088, while the sum is 55.

The spelling of 1406387271781 in words is "one trillion, four hundred six billion, three hundred eighty-seven million, two hundred seventy-one thousand, seven hundred eighty-one".