401961909129 has 24 divisors (see below), whose sum is σ = 589168890240. Its totient is φ = 243585286560.

The previous prime is 401961909113. The next prime is 401961909131. The reversal of 401961909129 is 921909169104.

It is a happy number.

It is not a de Polignac number, because 401961909129 - 2⁴ = 401961909113 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (401961902129) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3352192 + ... + 3470030.

It is an arithmetic number, because the mean of its divisors is an integer number (24548703760).

Almost surely, 2^401961909129 is an apocalyptic number.

It is an amenable number.

401961909129 is a deficient number, since it is larger than the sum of its proper divisors (187206981111).

401961909129 is a wasteful number, since it uses less digits than its factorization.

401961909129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127261 (or 127250 counting only the distinct ones).

The product of its (nonzero) digits is 314928, while the sum is 51.

It can be divided in two parts, 40196 and 1909129, that added together give a triangular number (1949325 = T₁₉₇₄).

The spelling of 401961909129 in words is "four hundred one billion, nine hundred sixty-one million, nine hundred nine thousand, one hundred twenty-nine".