1381587861457 has 4 divisors (see below), whose sum is σ = 1454303012080. Its totient is φ = 1308872710836.

The previous prime is 1381587861371. The next prime is 1381587861503. The reversal of 1381587861457 is 7541687851831.

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 a de Polignac number, because none of the positive numbers 2^k-1381587861457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1381587864457) 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, 36357575283 + ... + 36357575320.

It is an arithmetic number, because the mean of its divisors is an integer number (363575753020).

Almost surely, 2^{1381587861457} is an apocalyptic number.

It is an amenable number.

1381587861457 is a deficient number, since it is larger than the sum of its proper divisors (72715150623).

1381587861457 is an equidigital number, since it uses as much as digits as its factorization.

1381587861457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72715150622.

The product of its digits is 45158400, while the sum is 64.

The spelling of 1381587861457 in words is "one trillion, three hundred eighty-one billion, five hundred eighty-seven million, eight hundred sixty-one thousand, four hundred fifty-seven".