402154942261 has 4 divisors (see below), whose sum is σ = 402166189900. Its totient is φ = 402143694624.

The previous prime is 402154942181. The next prime is 402154942361. The reversal of 402154942261 is 162249451204.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 381269200900 + 20885741361 = 617470^2 + 144519^2 .

It is a cyclic number.

It is not a de Polignac number, because 402154942261 - 2¹⁷ = 402154811189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402154942361) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5570016 + ... + 5641753.

It is an arithmetic number, because the mean of its divisors is an integer number (100541547475).

Almost surely, 2^402154942261 is an apocalyptic number.

It is an amenable number.

402154942261 is a deficient number, since it is larger than the sum of its proper divisors (11247639).

402154942261 is a wasteful number, since it uses less digits than its factorization.

402154942261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11247638.

The product of its (nonzero) digits is 138240, while the sum is 40.

The spelling of 402154942261 in words is "four hundred two billion, one hundred fifty-four million, nine hundred forty-two thousand, two hundred sixty-one".