1651614491 has 2 divisors, whose sum is σ = 1651614492. Its totient is φ = 1651614490.

The previous prime is 1651614487. The next prime is 1651614499. The reversal of 1651614491 is 1944161561.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1651614491 - 2² = 1651614487 is a prime.

It is not a weakly prime, because it can be changed into another prime (1651614499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 825807245 + 825807246.

It is an arithmetic number, because the mean of its divisors is an integer number (825807246).

Almost surely, 2^1651614491 is an apocalyptic number.

1651614491 is a deficient number, since it is larger than the sum of its proper divisors (1).

1651614491 is an equidigital number, since it uses as much as digits as its factorization.

1651614491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25920, while the sum is 38.

The square root of 1651614491 is about 40640.0601746602. The cubic root of 1651614491 is about 1182.0510366924.

The spelling of 1651614491 in words is "one billion, six hundred fifty-one million, six hundred fourteen thousand, four hundred ninety-one".