161456501 has 2 divisors, whose sum is σ = 161456502. Its totient is φ = 161456500.

The previous prime is 161456467. The next prime is 161456513. The reversal of 161456501 is 105654161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 100600900 + 60855601 = 10030^2 + 7801^2 .

It is an emirp because it is prime and its reverse (105654161) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161456501 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161456551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80728250 + 80728251.

It is an arithmetic number, because the mean of its divisors is an integer number (80728251).

Almost surely, 2^161456501 is an apocalyptic number.

It is an amenable number.

161456501 is a deficient number, since it is larger than the sum of its proper divisors (1).

161456501 is an equidigital number, since it uses as much as digits as its factorization.

161456501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3600, while the sum is 29.

The square root of 161456501 is about 12706.5534666171. The cubic root of 161456501 is about 544.5258631981.

The spelling of 161456501 in words is "one hundred sixty-one million, four hundred fifty-six thousand, five hundred one".