1615340381 has 2 divisors, whose sum is σ = 1615340382. Its totient is φ = 1615340380.

The previous prime is 1615340341. The next prime is 1615340401. The reversal of 1615340381 is 1830435161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 952277881 + 663062500 = 30859^2 + 25750^2 .

It is an emirp because it is prime and its reverse (1830435161) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1615340381 is a prime.

It is a super-2 number, since 2×1615340381² = 5218649092978450322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1615340341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 807670190 + 807670191.

It is an arithmetic number, because the mean of its divisors is an integer number (807670191).

Almost surely, 2^1615340381 is an apocalyptic number.

It is an amenable number.

1615340381 is a deficient number, since it is larger than the sum of its proper divisors (1).

1615340381 is an equidigital number, since it uses as much as digits as its factorization.

1615340381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 1615340381 is about 40191.2973291483. The cubic root of 1615340381 is about 1173.3331744917. Note that the first 3 decimals are identical.

The spelling of 1615340381 in words is "one billion, six hundred fifteen million, three hundred forty thousand, three hundred eighty-one".