161435501 has 4 divisors (see below), whose sum is σ = 162944352. Its totient is φ = 159926652.

The previous prime is 161435453. The next prime is 161435503. The reversal of 161435501 is 105534161.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 105534161 = 29 ⋅3639109.

It is a cyclic number.

It is not a de Polignac number, because 161435501 - 2⁶ = 161435437 is a prime.

It is a super-2 number, since 2×161435501² = 52122841966242002, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161435503) 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, 754265 + ... + 754478.

It is an arithmetic number, because the mean of its divisors is an integer number (40736088).

Almost surely, 2^161435501 is an apocalyptic number.

It is an amenable number.

161435501 is a deficient number, since it is larger than the sum of its proper divisors (1508851).

161435501 is a wasteful number, since it uses less digits than its factorization.

161435501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1508850.

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 161435501 is about 12705.7270945035. The cubic root of 161435501 is about 544.5022540756.

Adding to 161435501 its reverse (105534161), we get a palindrome (266969662).

The spelling of 161435501 in words is "one hundred sixty-one million, four hundred thirty-five thousand, five hundred one".