1415239981 has 2 divisors, whose sum is σ = 1415239982. Its totient is φ = 1415239980.

The previous prime is 1415239939. The next prime is 1415240011. The reversal of 1415239981 is 1899325141.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1349386756 + 65853225 = 36734^2 + 8115^2 .

It is a cyclic number.

It is not a de Polignac number, because 1415239981 - 2¹³ = 1415231789 is a prime.

It is a super-2 number, since 2×1415239981² = 4005808407641760722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1415239901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 707619990 + 707619991.

It is an arithmetic number, because the mean of its divisors is an integer number (707619991).

Almost surely, 2^1415239981 is an apocalyptic number.

It is an amenable number.

1415239981 is a deficient number, since it is larger than the sum of its proper divisors (1).

1415239981 is an equidigital number, since it uses as much as digits as its factorization.

1415239981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 77760, while the sum is 43.

The square root of 1415239981 is about 37619.6754504873. The cubic root of 1415239981 is about 1122.7335389731.

The spelling of 1415239981 in words is "one billion, four hundred fifteen million, two hundred thirty-nine thousand, nine hundred eighty-one".