1401038861 has 2 divisors, whose sum is σ = 1401038862. Its totient is φ = 1401038860.

The previous prime is 1401038827. The next prime is 1401038869. The reversal of 1401038861 is 1688301041.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1115226025 + 285812836 = 33395^2 + 16906^2 .

It is a cyclic number.

It is not a de Polignac number, because 1401038861 - 2⁶ = 1401038797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1401038869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 700519430 + 700519431.

It is an arithmetic number, because the mean of its divisors is an integer number (700519431).

Almost surely, 2^1401038861 is an apocalyptic number.

It is an amenable number.

1401038861 is a deficient number, since it is larger than the sum of its proper divisors (1).

1401038861 is an equidigital number, since it uses as much as digits as its factorization.

1401038861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 1401038861 is about 37430.4536574164. The cubic root of 1401038861 is about 1118.9655789798.

The spelling of 1401038861 in words is "one billion, four hundred one million, thirty-eight thousand, eight hundred sixty-one".