1601427491 has 2 divisors, whose sum is σ = 1601427492. Its totient is φ = 1601427490.

The previous prime is 1601427461. The next prime is 1601427547. The reversal of 1601427491 is 1947241061.

It is a weak prime.

It is an emirp because it is prime and its reverse (1947241061) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1601427491 - 2¹⁰ = 1601426467 is a prime.

It is not a weakly prime, because it can be changed into another prime (1601427461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 800713745 + 800713746.

It is an arithmetic number, because the mean of its divisors is an integer number (800713746).

Almost surely, 2^1601427491 is an apocalyptic number.

1601427491 is a deficient number, since it is larger than the sum of its proper divisors (1).

1601427491 is an equidigital number, since it uses as much as digits as its factorization.

1601427491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 1601427491 is about 40017.8396593319. The cubic root of 1601427491 is about 1169.9548259764.

The spelling of 1601427491 in words is "one billion, six hundred one million, four hundred twenty-seven thousand, four hundred ninety-one".