1913671457 has 4 divisors (see below), whose sum is σ = 1913834160. Its totient is φ = 1913508756.

The previous prime is 1913671451. The next prime is 1913671483. The reversal of 1913671457 is 7541763191.

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: 7541763191 = 6961 ⋅1083431.

It is a cyclic number.

It is not a de Polignac number, because 1913671457 - 2¹² = 1913667361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1913671451) 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, 62207 + ... + 87732.

It is an arithmetic number, because the mean of its divisors is an integer number (478458540).

Almost surely, 2^1913671457 is an apocalyptic number.

It is an amenable number.

1913671457 is a deficient number, since it is larger than the sum of its proper divisors (162703).

1913671457 is a wasteful number, since it uses less digits than its factorization.

1913671457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162702.

The product of its digits is 158760, while the sum is 44.

The square root of 1913671457 is about 43745.5307088621. The cubic root of 1913671457 is about 1241.5259260345.

The spelling of 1913671457 in words is "one billion, nine hundred thirteen million, six hundred seventy-one thousand, four hundred fifty-seven".