691506103 has 2 divisors, whose sum is σ = 691506104. Its totient is φ = 691506102.

The previous prime is 691506097. The next prime is 691506149. The reversal of 691506103 is 301605196.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 691506103 - 2⁵ = 691506071 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (691506203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345753051 + 345753052.

It is an arithmetic number, because the mean of its divisors is an integer number (345753052).

Almost surely, 2^691506103 is an apocalyptic number.

691506103 is a deficient number, since it is larger than the sum of its proper divisors (1).

691506103 is an equidigital number, since it uses as much as digits as its factorization.

691506103 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4860, while the sum is 31.

The square root of 691506103 is about 26296.5036269083. The cubic root of 691506103 is about 884.2980604452.

The spelling of 691506103 in words is "six hundred ninety-one million, five hundred six thousand, one hundred three".