690945403 has 2 divisors, whose sum is σ = 690945404. Its totient is φ = 690945402.

The previous prime is 690945341. The next prime is 690945419. The reversal of 690945403 is 304549096.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 690945403 - 2¹³ = 690937211 is a prime.

It is not a weakly prime, because it can be changed into another prime (690945443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345472701 + 345472702.

It is an arithmetic number, because the mean of its divisors is an integer number (345472702).

Almost surely, 2^690945403 is an apocalyptic number.

690945403 is a deficient number, since it is larger than the sum of its proper divisors (1).

690945403 is an equidigital number, since it uses as much as digits as its factorization.

690945403 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 116640, while the sum is 40.

The square root of 690945403 is about 26285.8403517940. The cubic root of 690945403 is about 884.0589880820.

The spelling of 690945403 in words is "six hundred ninety million, nine hundred forty-five thousand, four hundred three".