1953663971 has 4 divisors (see below), whose sum is σ = 2232758832. Its totient is φ = 1674569112.

The previous prime is 1953663949. The next prime is 1953663983. The reversal of 1953663971 is 1793663591.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1953663971 - 2²² = 1949469667 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1953663911) 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, 139547420 + ... + 139547433.

It is an arithmetic number, because the mean of its divisors is an integer number (558189708).

Almost surely, 2^1953663971 is an apocalyptic number.

1953663971 is a deficient number, since it is larger than the sum of its proper divisors (279094861).

1953663971 is an equidigital number, since it uses as much as digits as its factorization.

1953663971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 279094860.

The product of its digits is 918540, while the sum is 50.

The square root of 1953663971 is about 44200.2711643266. The cubic root of 1953663971 is about 1250.1149699052.

The spelling of 1953663971 in words is "one billion, nine hundred fifty-three million, six hundred sixty-three thousand, nine hundred seventy-one".