401409761869 has 2 divisors, whose sum is σ = 401409761870. Its totient is φ = 401409761868.

The previous prime is 401409761821. The next prime is 401409761881. The reversal of 401409761869 is 968167904104.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 380892637225 + 20517124644 = 617165^2 + 143238^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-401409761869 is a prime.

It is a super-2 number, since 2×401409761869² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (401409761369) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200704880934 + 200704880935.

It is an arithmetic number, because the mean of its divisors is an integer number (200704880935).

Almost surely, 2^401409761869 is an apocalyptic number.

It is an amenable number.

401409761869 is a deficient number, since it is larger than the sum of its proper divisors (1).

401409761869 is an equidigital number, since it uses as much as digits as its factorization.

401409761869 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2612736, while the sum is 55.

The spelling of 401409761869 in words is "four hundred one billion, four hundred nine million, seven hundred sixty-one thousand, eight hundred sixty-nine".