1465640521 has 2 divisors, whose sum is σ = 1465640522. Its totient is φ = 1465640520.

The previous prime is 1465640503. The next prime is 1465640531. The reversal of 1465640521 is 1250465641.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1412932921 + 52707600 = 37589^2 + 7260^2 .

It is a cyclic number.

It is not a de Polignac number, because 1465640521 - 2¹⁵ = 1465607753 is a prime.

It is not a weakly prime, because it can be changed into another prime (1465640531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 732820260 + 732820261.

It is an arithmetic number, because the mean of its divisors is an integer number (732820261).

Almost surely, 2^1465640521 is an apocalyptic number.

It is an amenable number.

1465640521 is a deficient number, since it is larger than the sum of its proper divisors (1).

1465640521 is an equidigital number, since it uses as much as digits as its factorization.

1465640521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28800, while the sum is 34.

The square root of 1465640521 is about 38283.6847886930. The cubic root of 1465640521 is about 1135.9062466539.

The spelling of 1465640521 in words is "one billion, four hundred sixty-five million, six hundred forty thousand, five hundred twenty-one".