1642401139 has 2 divisors, whose sum is σ = 1642401140. Its totient is φ = 1642401138.

The previous prime is 1642401119. The next prime is 1642401143. The reversal of 1642401139 is 9311042461.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1642401139 - 2⁷ = 1642401011 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1642401139.

It is not a weakly prime, because it can be changed into another prime (1642401119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 821200569 + 821200570.

It is an arithmetic number, because the mean of its divisors is an integer number (821200570).

Almost surely, 2^1642401139 is an apocalyptic number.

1642401139 is a deficient number, since it is larger than the sum of its proper divisors (1).

1642401139 is an equidigital number, since it uses as much as digits as its factorization.

1642401139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 1642401139 is about 40526.5485700423. The cubic root of 1642401139 is about 1179.8489558175.

The spelling of 1642401139 in words is "one billion, six hundred forty-two million, four hundred one thousand, one hundred thirty-nine".