511021463947 has 2 divisors, whose sum is σ = 511021463948. Its totient is φ = 511021463946.

The previous prime is 511021463879. The next prime is 511021464017. The reversal of 511021463947 is 749364120115.

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-511021463947 is a prime.

It is a super-2 number, since 2×511021463947² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (511021467947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 255510731973 + 255510731974.

It is an arithmetic number, because the mean of its divisors is an integer number (255510731974).

Almost surely, 2^511021463947 is an apocalyptic number.

511021463947 is a deficient number, since it is larger than the sum of its proper divisors (1).

511021463947 is an equidigital number, since it uses as much as digits as its factorization.

511021463947 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 181440, while the sum is 43.

The spelling of 511021463947 in words is "five hundred eleven billion, twenty-one million, four hundred sixty-three thousand, nine hundred forty-seven".