402142031 has 2 divisors, whose sum is σ = 402142032. Its totient is φ = 402142030.

The previous prime is 402142019. The next prime is 402142033. The reversal of 402142031 is 130241204.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-402142031 is a prime.

It is a super-2 number, since 2×402142031² = 323436426193609922, which contains 22 as substring.

Together with 402142033, 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 (402142033) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201071015 + 201071016.

It is an arithmetic number, because the mean of its divisors is an integer number (201071016).

Almost surely, 2^402142031 is an apocalyptic number.

402142031 is a deficient number, since it is larger than the sum of its proper divisors (1).

402142031 is an equidigital number, since it uses as much as digits as its factorization.

402142031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 402142031 is about 20053.4792741808. The cubic root of 402142031 is about 738.1191772683.

Adding to 402142031 its reverse (130241204), we get a palindrome (532383235).

The spelling of 402142031 in words is "four hundred two million, one hundred forty-two thousand, thirty-one".