161357437 has 4 divisors (see below), whose sum is σ = 162628096. Its totient is φ = 160086780.

The previous prime is 161357411. The next prime is 161357459. The reversal of 161357437 is 734753161.

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.

It is a cyclic number.

It is not a de Polignac number, because 161357437 - 2⁷ = 161357309 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 161357396 and 161357405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161357467) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 635139 + ... + 635392.

It is an arithmetic number, because the mean of its divisors is an integer number (40657024).

Almost surely, 2^161357437 is an apocalyptic number.

It is an amenable number.

161357437 is a deficient number, since it is larger than the sum of its proper divisors (1270659).

161357437 is a wasteful number, since it uses less digits than its factorization.

161357437 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1270658.

The product of its digits is 52920, while the sum is 37.

The square root of 161357437 is about 12702.6547225373. The cubic root of 161357437 is about 544.4144731415.

The spelling of 161357437 in words is "one hundred sixty-one million, three hundred fifty-seven thousand, four hundred thirty-seven".