690414661 has 2 divisors, whose sum is σ = 690414662. Its totient is φ = 690414660.

The previous prime is 690414601. The next prime is 690414677. The reversal of 690414661 is 166414096.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 470456100 + 219958561 = 21690^2 + 14831^2 .

It is a cyclic number.

It is not a de Polignac number, because 690414661 - 2¹³ = 690406469 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 690414661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (690414601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345207330 + 345207331.

It is an arithmetic number, because the mean of its divisors is an integer number (345207331).

Almost surely, 2^690414661 is an apocalyptic number.

It is an amenable number.

690414661 is a deficient number, since it is larger than the sum of its proper divisors (1).

690414661 is an equidigital number, since it uses as much as digits as its factorization.

690414661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31104, while the sum is 37.

The square root of 690414661 is about 26275.7428248946. The cubic root of 690414661 is about 883.8325700836.

It can be divided in two parts, 690414 and 661, that multiplied together give a palindrome (456363654).

The spelling of 690414661 in words is "six hundred ninety million, four hundred fourteen thousand, six hundred sixty-one".