291086642 has 16 divisors (see below), whose sum is σ = 544370112. Its totient is φ = 113410320.

The previous prime is 291086641. The next prime is 291086647. The reversal of 291086642 is 246680192.

It is a junction number, because it is equal to n+sod(n) for n = 291086596 and 291086605.

It is not an unprimeable number, because it can be changed into a prime (291086641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 944933 + ... + 945240.

It is an arithmetic number, because the mean of its divisors is an integer number (34023132).

Almost surely, 2^291086642 is an apocalyptic number.

291086642 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

291086642 is a deficient number, since it is larger than the sum of its proper divisors (253283470).

291086642 is a wasteful number, since it uses less digits than its factorization.

291086642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1890193.

The product of its (nonzero) digits is 41472, while the sum is 38.

The square root of 291086642 is about 17061.2614422264. The cubic root of 291086642 is about 662.7362998055.

The spelling of 291086642 in words is "two hundred ninety-one million, eighty-six thousand, six hundred forty-two".