690406573 has 2 divisors, whose sum is σ = 690406574. Its totient is φ = 690406572.

The previous prime is 690406531. The next prime is 690406589. The reversal of 690406573 is 375604096.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 456377769 + 234028804 = 21363^2 + 15298^2 .

It is a cyclic number.

It is not a de Polignac number, because 690406573 - 2¹³ = 690398381 is a prime.

It is a super-2 number, since 2×690406573² = 953322472083208658, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (690400573) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345203286 + 345203287.

It is an arithmetic number, because the mean of its divisors is an integer number (345203287).

Almost surely, 2^690406573 is an apocalyptic number.

It is an amenable number.

690406573 is a deficient number, since it is larger than the sum of its proper divisors (1).

690406573 is an equidigital number, since it uses as much as digits as its factorization.

690406573 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 136080, while the sum is 40.

The square root of 690406573 is about 26275.5889182336. The cubic root of 690406573 is about 883.8291187926.

The spelling of 690406573 in words is "six hundred ninety million, four hundred six thousand, five hundred seventy-three".