1381148477 has 4 divisors (see below), whose sum is σ = 1382104416. Its totient is φ = 1380192540.

The previous prime is 1381148473. The next prime is 1381148491. The reversal of 1381148477 is 7748411831.

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 not a de Polignac number, because 1381148477 - 2² = 1381148473 is a prime.

It is a super-2 number, since 2×1381148477² = 3815142231038839058, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1381148473) 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, 475799 + ... + 478692.

It is an arithmetic number, because the mean of its divisors is an integer number (345526104).

Almost surely, 2^1381148477 is an apocalyptic number.

It is an amenable number.

1381148477 is a deficient number, since it is larger than the sum of its proper divisors (955939).

1381148477 is an equidigital number, since it uses as much as digits as its factorization.

1381148477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 955938.

The product of its digits is 150528, while the sum is 44.

The square root of 1381148477 is about 37163.8060079965. The cubic root of 1381148477 is about 1113.6450463926.

The spelling of 1381148477 in words is "one billion, three hundred eighty-one million, one hundred forty-eight thousand, four hundred seventy-seven".