291991429 has 2 divisors, whose sum is σ = 291991430. Its totient is φ = 291991428.

The previous prime is 291991367. The next prime is 291991433. The reversal of 291991429 is 924199192.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 291487329 + 504100 = 17073^2 + 710^2 .

It is a cyclic number.

It is not a de Polignac number, because 291991429 - 2¹⁵ = 291958661 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (291991229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 145995714 + 145995715.

It is an arithmetic number, because the mean of its divisors is an integer number (145995715).

Almost surely, 2^291991429 is an apocalyptic number.

It is an amenable number.

291991429 is a deficient number, since it is larger than the sum of its proper divisors (1).

291991429 is an equidigital number, since it uses as much as digits as its factorization.

291991429 is an evil number, because the sum of its binary digits is even.

The product of its digits is 104976, while the sum is 46.

The square root of 291991429 is about 17087.7566988765. The cubic root of 291991429 is about 663.4222524728.

It can be divided in two parts, 29199 and 1429, that added together give a triangular number (30628 = T₂₄₇).

The spelling of 291991429 in words is "two hundred ninety-one million, nine hundred ninety-one thousand, four hundred twenty-nine".