1385758961 has 4 divisors (see below), whose sum is σ = 1467274212. Its totient is φ = 1304243712.

The previous prime is 1385758949. The next prime is 1385758963. The reversal of 1385758961 is 1698575831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1698575831 = 359 ⋅4731409.

It can be written as a sum of positive squares in 2 ways, for example, as 971880625 + 413878336 = 31175^2 + 20344^2 .

It is a cyclic number.

It is not a de Polignac number, because 1385758961 - 2⁶ = 1385758897 is a prime.

It is a super-3 number, since 3×1385758961³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1385758963) 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, 40757600 + ... + 40757633.

It is an arithmetic number, because the mean of its divisors is an integer number (366818553).

Almost surely, 2^1385758961 is an apocalyptic number.

It is an amenable number.

1385758961 is a deficient number, since it is larger than the sum of its proper divisors (81515251).

1385758961 is an equidigital number, since it uses as much as digits as its factorization.

1385758961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81515250.

The product of its digits is 1814400, while the sum is 53.

The square root of 1385758961 is about 37225.7835511894. The cubic root of 1385758961 is about 1114.8828423625.

The spelling of 1385758961 in words is "one billion, three hundred eighty-five million, seven hundred fifty-eight thousand, nine hundred sixty-one".