1461521947 has 2 divisors, whose sum is σ = 1461521948. Its totient is φ = 1461521946.

The previous prime is 1461521927. The next prime is 1461521983. The reversal of 1461521947 is 7491251641.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1461521947 is a prime.

It is not a weakly prime, because it can be changed into another prime (1461521927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 730760973 + 730760974.

It is an arithmetic number, because the mean of its divisors is an integer number (730760974).

Almost surely, 2^1461521947 is an apocalyptic number.

1461521947 is a deficient number, since it is larger than the sum of its proper divisors (1).

1461521947 is an equidigital number, since it uses as much as digits as its factorization.

1461521947 is an evil number, because the sum of its binary digits is even.

The product of its digits is 60480, while the sum is 40.

The square root of 1461521947 is about 38229.8567483583. The cubic root of 1461521947 is about 1134.8412508668.

The spelling of 1461521947 in words is "one billion, four hundred sixty-one million, five hundred twenty-one thousand, nine hundred forty-seven".