165240451 has 4 divisors (see below), whose sum is σ = 165271392. Its totient is φ = 165209512.

The previous prime is 165240437. The next prime is 165240457. The reversal of 165240451 is 154042561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 154042561 = 6133 ⋅25117.

It is a cyclic number.

It is not a de Polignac number, because 165240451 - 2⁵ = 165240419 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165240457) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5176 + ... + 18901.

It is an arithmetic number, because the mean of its divisors is an integer number (41317848).

Almost surely, 2^165240451 is an apocalyptic number.

165240451 is a deficient number, since it is larger than the sum of its proper divisors (30941).

165240451 is an equidigital number, since it uses as much as digits as its factorization.

165240451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30940.

The product of its (nonzero) digits is 4800, while the sum is 28.

The square root of 165240451 is about 12854.5887137629. The cubic root of 165240451 is about 548.7469556686.

The spelling of 165240451 in words is "one hundred sixty-five million, two hundred forty thousand, four hundred fifty-one".