1690425057 has 4 divisors (see below), whose sum is σ = 2253900080. Its totient is φ = 1126950036.

The previous prime is 1690425049. The next prime is 1690425059. The reversal of 1690425057 is 7505240961.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 7505240961 = 3 ⋅2501746987.

It is not a de Polignac number, because 1690425057 - 2³ = 1690425049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1690425059) 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, 281737507 + ... + 281737512.

It is an arithmetic number, because the mean of its divisors is an integer number (563475020).

Almost surely, 2^1690425057 is an apocalyptic number.

It is an amenable number.

1690425057 is a deficient number, since it is larger than the sum of its proper divisors (563475023).

1690425057 is an equidigital number, since it uses as much as digits as its factorization.

1690425057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 563475022.

The product of its (nonzero) digits is 75600, while the sum is 39.

The square root of 1690425057 is about 41114.7790581440. The cubic root of 1690425057 is about 1191.2382790987.

The spelling of 1690425057 in words is "one billion, six hundred ninety million, four hundred twenty-five thousand, fifty-seven".