1690431401 has 2 divisors, whose sum is σ = 1690431402. Its totient is φ = 1690431400.

The previous prime is 1690431377. The next prime is 1690431419. The reversal of 1690431401 is 1041340961.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1434591376 + 255840025 = 37876^2 + 15995^2 .

It is a cyclic number.

It is not a de Polignac number, because 1690431401 - 2²² = 1686237097 is a prime.

It is not a weakly prime, because it can be changed into another prime (1690431101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 845215700 + 845215701.

It is an arithmetic number, because the mean of its divisors is an integer number (845215701).

Almost surely, 2^1690431401 is an apocalyptic number.

It is an amenable number.

1690431401 is a deficient number, since it is larger than the sum of its proper divisors (1).

1690431401 is an equidigital number, since it uses as much as digits as its factorization.

1690431401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 1690431401 is about 41114.8562079451. The cubic root of 1690431401 is about 1191.2397692971.

The spelling of 1690431401 in words is "one billion, six hundred ninety million, four hundred thirty-one thousand, four hundred one".