402261031 has 2 divisors, whose sum is σ = 402261032. Its totient is φ = 402261030.

The previous prime is 402261029. The next prime is 402261049. The reversal of 402261031 is 130162204.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 402261031 - 2¹ = 402261029 is a prime.

It is a super-2 number, since 2×402261031² = 323627874122365922, which contains 22 as substring.

Together with 402261029, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (402261071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201130515 + 201130516.

It is an arithmetic number, because the mean of its divisors is an integer number (201130516).

Almost surely, 2^402261031 is an apocalyptic number.

402261031 is a deficient number, since it is larger than the sum of its proper divisors (1).

402261031 is an equidigital number, since it uses as much as digits as its factorization.

402261031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 402261031 is about 20056.4461208859. The cubic root of 402261031 is about 738.1919770196.

The spelling of 402261031 in words is "four hundred two million, two hundred sixty-one thousand, thirty-one".