1955493561 has 64 divisors (see below), whose sum is σ = 3210762240. Its totient is φ = 1033344000.

The previous prime is 1955493539. The next prime is 1955493569. The reversal of 1955493561 is 1653945591.

It is not a de Polignac number, because 1955493561 - 2⁶ = 1955493497 is a prime.

It is a super-2 number, since 2×1955493561² = 7647910134224921442, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1955493561.

It is not an unprimeable number, because it can be changed into a prime (1955493569) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 7790686 + ... + 7790936.

It is an arithmetic number, because the mean of its divisors is an integer number (50168160).

Almost surely, 2^1955493561 is an apocalyptic number.

It is an amenable number.

1955493561 is a deficient number, since it is larger than the sum of its proper divisors (1255268679).

1955493561 is a wasteful number, since it uses less digits than its factorization.

1955493561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 574.

The product of its digits is 729000, while the sum is 48.

The square root of 1955493561 is about 44220.9629135323. The cubic root of 1955493561 is about 1250.5050888940.

The spelling of 1955493561 in words is "one billion, nine hundred fifty-five million, four hundred ninety-three thousand, five hundred sixty-one".