1131639947 has 2 divisors, whose sum is σ = 1131639948. Its totient is φ = 1131639946.

The previous prime is 1131639937. The next prime is 1131639953. The reversal of 1131639947 is 7499361311.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1131639947 - 2²² = 1127445643 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1131639898 and 1131639907.

It is not a weakly prime, because it can be changed into another prime (1131639907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 565819973 + 565819974.

It is an arithmetic number, because the mean of its divisors is an integer number (565819974).

Almost surely, 2^1131639947 is an apocalyptic number.

1131639947 is a deficient number, since it is larger than the sum of its proper divisors (1).

1131639947 is an equidigital number, since it uses as much as digits as its factorization.

1131639947 is an evil number, because the sum of its binary digits is even.

The product of its digits is 122472, while the sum is 44.

The square root of 1131639947 is about 33639.8565246643. The cubic root of 1131639947 is about 1042.0840688849.

The spelling of 1131639947 in words is "one billion, one hundred thirty-one million, six hundred thirty-nine thousand, nine hundred forty-seven".