1934515981 has 2 divisors, whose sum is σ = 1934515982. Its totient is φ = 1934515980.

The previous prime is 1934515927. The next prime is 1934516009. The reversal of 1934515981 is 1895154391.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1915462756 + 19053225 = 43766^2 + 4365^2 .

It is a cyclic number.

It is not a de Polignac number, because 1934515981 - 2⁷ = 1934515853 is a prime.

It is a super-2 number, since 2×1934515981² = 7484704161488784722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1934515081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 967257990 + 967257991.

It is an arithmetic number, because the mean of its divisors is an integer number (967257991).

Almost surely, 2^1934515981 is an apocalyptic number.

It is an amenable number.

1934515981 is a deficient number, since it is larger than the sum of its proper divisors (1).

1934515981 is an equidigital number, since it uses as much as digits as its factorization.

1934515981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 194400, while the sum is 46.

The square root of 1934515981 is about 43983.1329147891. The cubic root of 1934515981 is about 1246.0174005438.

The spelling of 1934515981 in words is "one billion, nine hundred thirty-four million, five hundred fifteen thousand, nine hundred eighty-one".