1385241531 has 16 divisors (see below), whose sum is σ = 1967629440. Its totient is φ = 864345600.

The previous prime is 1385241511. The next prime is 1385241623. The reversal of 1385241531 is 1351425831.

It is not a de Polignac number, because 1385241531 - 2²⁶ = 1318132667 is a prime.

It is a super-2 number, since 2×1385241531² = 3837788198414447922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1385241492 and 1385241501.

It is not an unprimeable number, because it can be changed into a prime (1385241511) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 141670 + ... + 151131.

It is an arithmetic number, because the mean of its divisors is an integer number (122976840).

Almost surely, 2^1385241531 is an apocalyptic number.

1385241531 is a deficient number, since it is larger than the sum of its proper divisors (582387909).

1385241531 is a wasteful number, since it uses less digits than its factorization.

1385241531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 292906.

The product of its digits is 14400, while the sum is 33.

The square root of 1385241531 is about 37218.8330150208. The cubic root of 1385241531 is about 1114.7440626613.

The spelling of 1385241531 in words is "one billion, three hundred eighty-five million, two hundred forty-one thousand, five hundred thirty-one".