161520537 has 8 divisors (see below), whose sum is σ = 215447040. Its totient is φ = 107637200.

The previous prime is 161520533. The next prime is 161520547. The reversal of 161520537 is 735025161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 161520537 - 2² = 161520533 is a prime.

It is not an unprimeable number, because it can be changed into a prime (161520533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 714 + ... + 17987.

It is an arithmetic number, because the mean of its divisors is an integer number (26930880).

Almost surely, 2^161520537 is an apocalyptic number.

It is an amenable number.

161520537 is a deficient number, since it is larger than the sum of its proper divisors (53926503).

161520537 is a wasteful number, since it uses less digits than its factorization.

161520537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21583.

The product of its (nonzero) digits is 6300, while the sum is 30.

The square root of 161520537 is about 12709.0730189105. The cubic root of 161520537 is about 544.5978426458.

Adding to 161520537 its reverse (735025161), we get a palindrome (896545698).

The spelling of 161520537 in words is "one hundred sixty-one million, five hundred twenty thousand, five hundred thirty-seven".