1247942971 has 16 divisors (see below), whose sum is σ = 1447257600. Its totient is φ = 1064124000.

The previous prime is 1247942951. The next prime is 1247942977. The reversal of 1247942971 is 1792497421.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1247942971 - 2²³ = 1239554363 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1247942977) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8451 + ... + 50668.

It is an arithmetic number, because the mean of its divisors is an integer number (90453600).

Almost surely, 2^1247942971 is an apocalyptic number.

1247942971 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1247942971 is a deficient number, since it is larger than the sum of its proper divisors (199314629).

1247942971 is a wasteful number, since it uses less digits than its factorization.

1247942971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59250.

The product of its digits is 254016, while the sum is 46.

The square root of 1247942971 is about 35326.2362982529. The cubic root of 1247942971 is about 1076.6261226360.

It can be divided in two parts, 124794 and 2971, that added together give a triangular number (127765 = T₅₀₅).

The spelling of 1247942971 in words is "one billion, two hundred forty-seven million, nine hundred forty-two thousand, nine hundred seventy-one".