1509142981 has 6 divisors (see below), whose sum is σ = 1512427046. Its totient is φ = 1505862600.

The previous prime is 1509142951. The next prime is 1509142991. The reversal of 1509142981 is 1892419051.

It can be written as a sum of positive squares in only one way, i.e., 1426950625 + 82192356 = 37775^2 + 9066^2 .

It is not a de Polignac number, because 1509142981 - 2¹³ = 1509134789 is a prime.

It is a super-2 number, since 2×1509142981² = 4555025074203132722, 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 (1509142931) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 998016 + ... + 999526.

Almost surely, 2^1509142981 is an apocalyptic number.

It is an amenable number.

1509142981 is a deficient number, since it is larger than the sum of its proper divisors (3284065).

1509142981 is an frugal number, since it uses more digits than its factorization.

1509142981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3683 (or 2172 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 40.

The square root of 1509142981 is about 38847.6895194553. The cubic root of 1509142981 is about 1147.0353331180.

The spelling of 1509142981 in words is "one billion, five hundred nine million, one hundred forty-two thousand, nine hundred eighty-one".