1959501161 has 4 divisors (see below), whose sum is σ = 1974930432. Its totient is φ = 1944071892.

The previous prime is 1959501157. The next prime is 1959501191. The reversal of 1959501161 is 1611059591.

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: 1611059591 = 29 ⋅55553779.

It is a cyclic number.

It is not a de Polignac number, because 1959501161 - 2² = 1959501157 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1959501121) 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, 7714445 + ... + 7714698.

It is an arithmetic number, because the mean of its divisors is an integer number (493732608).

Almost surely, 2^1959501161 is an apocalyptic number.

It is an amenable number.

1959501161 is a deficient number, since it is larger than the sum of its proper divisors (15429271).

1959501161 is a wasteful number, since it uses less digits than its factorization.

1959501161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15429270.

The product of its (nonzero) digits is 12150, while the sum is 38.

The square root of 1959501161 is about 44266.2530716120. The cubic root of 1959501161 is about 1251.3587701398.

The spelling of 1959501161 in words is "one billion, nine hundred fifty-nine million, five hundred one thousand, one hundred sixty-one".