691047019151 has 2 divisors, whose sum is σ = 691047019152. Its totient is φ = 691047019150.

The previous prime is 691047019147. The next prime is 691047019189. The reversal of 691047019151 is 151910740196.

691047019151 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 691047019151 - 2² = 691047019147 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (691047019111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345523509575 + 345523509576.

It is an arithmetic number, because the mean of its divisors is an integer number (345523509576).

Almost surely, 2^691047019151 is an apocalyptic number.

691047019151 is a deficient number, since it is larger than the sum of its proper divisors (1).

691047019151 is an equidigital number, since it uses as much as digits as its factorization.

691047019151 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 68040, while the sum is 44.

The spelling of 691047019151 in words is "six hundred ninety-one billion, forty-seven million, nineteen thousand, one hundred fifty-one".