153994691 has 2 divisors, whose sum is σ = 153994692. Its totient is φ = 153994690.

The previous prime is 153994681. The next prime is 153994693. The reversal of 153994691 is 196499351.

It is a happy number.

153994691 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-153994691 is a prime.

Together with 153994693, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (153994693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 76997345 + 76997346.

It is an arithmetic number, because the mean of its divisors is an integer number (76997346).

Almost surely, 2^153994691 is an apocalyptic number.

153994691 is a deficient number, since it is larger than the sum of its proper divisors (1).

153994691 is an equidigital number, since it uses as much as digits as its factorization.

153994691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 262440, while the sum is 47.

The square root of 153994691 is about 12409.4597384415. The cubic root of 153994691 is about 536.0046815419.

The spelling of 153994691 in words is "one hundred fifty-three million, nine hundred ninety-four thousand, six hundred ninety-one".