1301001491 has 2 divisors, whose sum is σ = 1301001492. Its totient is φ = 1301001490.

The previous prime is 1301001487. The next prime is 1301001563. The reversal of 1301001491 is 1941001031.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1301001491 - 2² = 1301001487 is a prime.

It is not a weakly prime, because it can be changed into another prime (1301001461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 650500745 + 650500746.

It is an arithmetic number, because the mean of its divisors is an integer number (650500746).

Almost surely, 2^1301001491 is an apocalyptic number.

1301001491 is a deficient number, since it is larger than the sum of its proper divisors (1).

1301001491 is an equidigital number, since it uses as much as digits as its factorization.

1301001491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108, while the sum is 20.

The square root of 1301001491 is about 36069.3982622389. The cubic root of 1301001491 is about 1091.6730726997.

The spelling of 1301001491 in words is "one billion, three hundred one million, one thousand, four hundred ninety-one".