1917656045 has 8 divisors (see below), whose sum is σ = 2302828920. Its totient is φ = 1533030400.

The previous prime is 1917656011. The next prime is 1917656057. The reversal of 1917656045 is 5406567191.

It can be written as a sum of positive squares in 4 ways, for example, as 15038884 + 1902617161 = 3878^2 + 43619^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1917656045 - 2²⁴ = 1900878829 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1917655987 and 1917656005.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 129056 + ... + 143145.

It is an arithmetic number, because the mean of its divisors is an integer number (287853615).

Almost surely, 2^1917656045 is an apocalyptic number.

It is an amenable number.

1917656045 is a deficient number, since it is larger than the sum of its proper divisors (385172875).

1917656045 is a wasteful number, since it uses less digits than its factorization.

1917656045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 273615.

The product of its (nonzero) digits is 226800, while the sum is 44.

The square root of 1917656045 is about 43791.0498275618. The cubic root of 1917656045 is about 1242.3870177297.

The spelling of 1917656045 in words is "one billion, nine hundred seventeen million, six hundred fifty-six thousand, forty-five".