47290781 has 2 divisors, whose sum is σ = 47290782. Its totient is φ = 47290780.

The previous prime is 47290777. The next prime is 47290813. The reversal of 47290781 is 18709274.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 45010681 + 2280100 = 6709^2 + 1510^2 .

It is a cyclic number.

It is not a de Polignac number, because 47290781 - 2² = 47290777 is a prime.

It is a super-2 number, since 2×47290781² = 4472835935179922, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (47290741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23645390 + 23645391.

It is an arithmetic number, because the mean of its divisors is an integer number (23645391).

Almost surely, 2^47290781 is an apocalyptic number.

It is an amenable number.

47290781 is a deficient number, since it is larger than the sum of its proper divisors (1).

47290781 is an equidigital number, since it uses as much as digits as its factorization.

47290781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28224, while the sum is 38.

The square root of 47290781 is about 6876.8292839069. The cubic root of 47290781 is about 361.6253181957.

The spelling of 47290781 in words is "forty-seven million, two hundred ninety thousand, seven hundred eighty-one".