213691494 has 16 divisors (see below), whose sum is σ = 441169920. Its totient is φ = 68932680.

The previous prime is 213691493. The next prime is 213691501. The reversal of 213691494 is 494196312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213691493) 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, 574254 + ... + 574625.

It is an arithmetic number, because the mean of its divisors is an integer number (27573120).

Almost surely, 2^213691494 is an apocalyptic number.

213691494 is an abundant number, since it is smaller than the sum of its proper divisors (227478426).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

213691494 is a wasteful number, since it uses less digits than its factorization.

213691494 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1148915.

The product of its digits is 46656, while the sum is 39.

The square root of 213691494 is about 14618.1905172973. The cubic root of 213691494 is about 597.8548340229.

Adding to 213691494 its product of digits (46656), we get a triangular number (213738150 = T₂₀₆₇₅).

It can be divided in two parts, 213691 and 494, that added together give a triangular number (214185 = T₆₅₄).

The spelling of 213691494 in words is "two hundred thirteen million, six hundred ninety-one thousand, four hundred ninety-four".