1956634489 has 4 divisors (see below), whose sum is σ = 1957031824. Its totient is φ = 1956237156.

The previous prime is 1956634451. The next prime is 1956634507. The reversal of 1956634489 is 9844366591.

It is a happy number.

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 1956634489 - 2⁹ = 1956633977 is a prime.

It is a super-2 number, since 2×1956634489² = 7656837047088582242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1956634189) 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, 191187 + ... + 201160.

It is an arithmetic number, because the mean of its divisors is an integer number (489257956).

Almost surely, 2^1956634489 is an apocalyptic number.

It is an amenable number.

1956634489 is a deficient number, since it is larger than the sum of its proper divisors (397335).

1956634489 is an equidigital number, since it uses as much as digits as its factorization.

1956634489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 397334.

The product of its digits is 5598720, while the sum is 55.

The square root of 1956634489 is about 44233.8613394761. The cubic root of 1956634489 is about 1250.7482430032.

The spelling of 1956634489 in words is "one billion, nine hundred fifty-six million, six hundred thirty-four thousand, four hundred eighty-nine".