1601513491 has 2 divisors, whose sum is σ = 1601513492. Its totient is φ = 1601513490.

The previous prime is 1601513479. The next prime is 1601513497. The reversal of 1601513491 is 1943151061.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1601513491 - 2¹⁵ = 1601480723 is a prime.

It is not a weakly prime, because it can be changed into another prime (1601513497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 800756745 + 800756746.

It is an arithmetic number, because the mean of its divisors is an integer number (800756746).

Almost surely, 2^1601513491 is an apocalyptic number.

1601513491 is a deficient number, since it is larger than the sum of its proper divisors (1).

1601513491 is an equidigital number, since it uses as much as digits as its factorization.

1601513491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3240, while the sum is 31.

The square root of 1601513491 is about 40018.9141656792. The cubic root of 1601513491 is about 1169.9757686072.

The spelling of 1601513491 in words is "one billion, six hundred one million, five hundred thirteen thousand, four hundred ninety-one".