161651507 has 2 divisors, whose sum is σ = 161651508. Its totient is φ = 161651506.

The previous prime is 161651461. The next prime is 161651509. The reversal of 161651507 is 705156161.

161651507 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 an emirp because it is prime and its reverse (705156161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 161651507 - 2⁶ = 161651443 is a prime.

It is a super-2 number, since 2×161651507² = 52262419430742098, which contains 22 as substring.

Together with 161651509, 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 (161651509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80825753 + 80825754.

It is an arithmetic number, because the mean of its divisors is an integer number (80825754).

Almost surely, 2^161651507 is an apocalyptic number.

161651507 is a deficient number, since it is larger than the sum of its proper divisors (1).

161651507 is an equidigital number, since it uses as much as digits as its factorization.

161651507 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6300, while the sum is 32.

The square root of 161651507 is about 12714.2245929510. The cubic root of 161651507 is about 544.7449998042.

The spelling of 161651507 in words is "one hundred sixty-one million, six hundred fifty-one thousand, five hundred seven".