1020115681 has 8 divisors (see below), whose sum is σ = 1156406720. Its totient is φ = 892084752.

The previous prime is 1020115633. The next prime is 1020115693. The reversal of 1020115681 is 1865110201.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1020115681 - 2¹³ = 1020107489 is a prime.

It is a super-2 number, since 2×1020115681² = 2081272005244187522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1020115601) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2064765 + ... + 2065258.

It is an arithmetic number, because the mean of its divisors is an integer number (144550840).

Almost surely, 2^1020115681 is an apocalyptic number.

It is an amenable number.

1020115681 is a deficient number, since it is larger than the sum of its proper divisors (136291039).

1020115681 is a wasteful number, since it uses less digits than its factorization.

1020115681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4130055.

The product of its (nonzero) digits is 480, while the sum is 25.

The square root of 1020115681 is about 31939.2498503017. The cubic root of 1020115681 is about 1006.6607627365.

Adding to 1020115681 its reverse (1865110201), we get a palindrome (2885225882).

The spelling of 1020115681 in words is "one billion, twenty million, one hundred fifteen thousand, six hundred eighty-one".